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REVIEW 4 major objections 5 minor 2 cited by

Moonbeam: A MIDI Foundation Model Using Both Absolute and Relative Music Attributes

T0 review · 4 major / 5 minor · reviewed 2026-08-07 · deepseek-v4-flash

Pith's one-line read Moonbeam, a transformer pretrained on 81.6K hours of MIDI, encodes notes with absolute and relative musical attributes in five dimensions, and beats larger pretrained music models on most classification benchmarks.

desk verdict Solid architecture paper undercut by an unresolved PiJAMA30 pretraining-overlap question. read the letter →

arxiv 2505.15559 v1 pith:K6F35A2S submitted 2025-05-21 cs.SD cs.AIeess.AS

classification cs.SDcs.AIeess.AS
keywords symbolicmusicMIDIfoundationmodeltokenizationmultidimensionalrelativeattentionclassificationconditionalgenerationinfilling
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper sets out to establish that a single autoregressive transformer, pretrained directly on MIDI rather than on ABC text scores, can serve as a general foundation model for symbolic music. Its central move is to represent each note event by both its absolute values (onset time, duration, octave, pitch class, instrument, velocity) and its relative relationships, which is how musicians perceive music; a novel tokenizer with continuous sinusoidal embeddings and a Multidimensional Relative Attention mechanism carry this through without added parameters. On three classification tasks across four datasets, the 309M- and 839M-parameter models beat the larger pretrained symbolic music models in most cases, and the finetuned conditional generation model is rated by expert listeners as fitting the given chord and metadata conditions better than a strong REMI-style transformer baseline, despite scoring slightly lower on objective pitch and velocity accuracy. If these findings hold, they show that music-specific inductive biases scale to hundreds of millions of parameters and that expressive, multi-instrument MIDI data can serve as a usable pretraining substrate.

What carries the argument

The load-bearing machinery has three parts. First, the tokenizer: each note event becomes the compound token $x = (o, d, oct, p, i, v)$ — absolute onset, duration, octave, pitch class, instrument, velocity — with all attributes except the instrument encoded by the continuous sinusoidal Fundamental Music Embedding (FME), which preserves relative musical information in the embedding space and extrapolates to unseen inputs without extra trainable parameters. Second, Multidimensional Relative Attention (MRA): an extension of RoPE in which the attention heads are partitioned into $G = 6$ groups and each group is rotated by the value of one musical attribute (onset, duration, octave, pitch class, velocity; the instrument group reuses onset), so the query-key dot product encodes the relative difference along each axis, parameter-free. Third, a GRU sub-decoder that sequentially samples the six sub-tokens of each event, capturing dependencies such as a high pitch making a bass instrument unlikely. For finetuning, classification appends a $\langle cls\rangle$ token and swaps the GRU for a linear head with LoRA, while conditional generation prepends metadata and chord-control sequences to the input so that, with absolute onsets and MRA, the model can attend to the entire control sequence, including future control events, giving it full anticipatory capability for music infilling.

What would settle it

Match the PiJAMA30 test pieces against the pretraining files listed in Table 5 by MIDI file identity or near-duplicate sequence comparison, then re-evaluate (or retrain) Moonbeam with all PiJAMA pieces removed from the corpus. If PiJAMA30 accuracy falls from 0.679 toward Clamp2's 0.440, the reported margin is substantially memorization; if the margin holds under this holdout, the architectural claim survives this attack.

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Extended reading notes

Core claim

On the paper's own terms, the discovery is that Moonbeam is the first autoregressive transformer foundation model pretrained at scale on diverse MIDI — 81.6K hours and 18 billion tokens covering piano performance, scores, guitar, bass, drums, saxophone, and multitrack music — and that its gains come from jointly preserving absolute and relative musical information. Each event is a six-part compound token (absolute onset, duration, octave, pitch class, instrument, velocity), embedded with the continuous Fundamental Music Embedding so relative information survives in the embedding space and unseen values (microtones, long durations, large onsets) can be handled without new lookup entries. Multidimensional Relative Attention partitions the attention heads into six groups and rotates each group by one musical attribute in the manner of RoPE, so the attention score between two events encodes their differences in onset, duration, octave, pitch, and velocity with no extra trainable parameters. The paper argues this is why Moonbeam (M) surpasses Clamp2, M3, and MusicBERT on most of the PiJAMA30, Pianist8, Emopia, and GPM30 benchmarks (M3 retains the best Emopia score by about two points), and why its finetuned generation model, using absolute onsets for full anticipatory music infilling, earns significantly higher expert ratings than the CoMMU transformer baseline.

Load-bearing premise

The load-bearing premise is that the downstream benchmarks measure generalization rather than memorization: the pretraining table (Appendix A, Table 5) includes the PiJAMA dataset, while the player-classification benchmark PiJAMA30 (Section 5.2) is drawn from PiJAMA, and the paper never states that the PiJAMA30 test pieces were left out of pretraining; the separate private test set described in Appendix A serves the perplexity evaluation, not this downstream split.

Editorial extensions

If this is right

  • A single backbone pretrained on MIDI can be finetuned into both a music classifier and a controllable generator, so the covered task families no longer require bespoke per-task tokenizers.
  • Because MRA adds no parameters, the relative-information advantage seen in earlier small music models carries to the 309M and 839M scales; in the paper's ablation, replacing MRA with standard attention raises test perplexity from 2.423 to 2.512, and removing FME raises it to 4.216.
  • Absolute onset values plus MRA give the generation model full anticipatory capability, so a control sequence can bracket a gap in time and the model can fill it while attending to both past and future control events, without an extra encoder or interleaved control tokens.
  • The expert listening test (p-values from about $10^{-12}$ to $10^{-17}$) indicates the generation advantage is perceptually real to trained listeners on chord fit, metadata fit, coherence, and overall enjoyment, even though objective pitch and velocity accuracy slightly favour the baseline.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The decisive control the paper does not run is removing PiJAMA entirely from the pretraining corpus before measuring PiJAMA30; the reported margin over Clamp2 (0.679 vs. 0.440) is only convincing as an architectural effect once that overlap is ruled out.
  • The contrast between the objective metrics (the baseline is at or near ceiling at the widest tolerance, with pitch accuracy 0.993 and velocity accuracy 1.000, versus Moonbeam's 0.952 and 0.968) and the subjective ratings (Moonbeam clearly ahead) suggests that current 'condition adherence' metrics do not capture what expert listeners value; a follow-up study separating adherence from coherence in t
  • Because FME is a continuous embedding, the tokenizer is not locked to the autoregressive GRU decoder; it could also feed diffusion or masked generative models for symbolic music, which the paper does not test.
  • MRA's recipe of rotating head groups by per-axis coordinates transfers to other sequential domains with known geometry, such as video (time plus spatial axes) or robotics (time plus joint angles); the paper names robotics as a prospect but gives no evidence, so this remains a conjecture.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 5 minor

Summary. Moonbeam is an autoregressive transformer-based symbolic music foundation model. The paper introduces a tokenizer that combines standard embeddings for instruments with the Fundamental Music Embedding (FME) for onset, duration, octave, pitch class, and velocity; Multidimensional Relative Attention (MRA), which extends RoPE to five musical axes by partitioning attention heads into groups; and a GRU sub-decoder for predicting the six sub-events of each compound token. Models of 309M and 839M parameters are pretrained on 81.6K hours of MIDI (18.06B tokens). The paper reports ablations on the small model and fine-tunes on player, emotion, and composer classification (PiJAMA30, Pianist8, Emopia, GPM30) as well as on conditional generation and music infilling using CoMMU. The main claims are that Moonbeam outperforms MusicBERT, Clamp2, and M3 on most classification tasks, and that the finetuned generation model outperforms a REMI-like transformer baseline in listening tests.

Significance. If the results are validated, this is a substantial contribution: MRA is a clean, parameter-free extension of RoPE to multi-dimensional musical positions; the FME-based tokenizer handles a wide range of MIDI formats; the paper releases code, weights, and samples; and the training-data disclosure (Table 5) is more detailed than in most comparable work. The ablation design is sensible and the MRA math in Appendix F is straightforward. However, the PiJAMA30 train/test overlap is a serious correctness risk for the headline classification claim, and the absence of variance or significance measures weakens the 'outperforms in most cases' statement. The generation result also depends heavily on the subjective listening test, whose protocol is only partially described. These issues are fixable within the scope of the manuscript, but they need to be addressed before the empirical claims can be accepted.

major comments (4)
  1. [Appendix A, Table 5; Section 5.2, Table 2] PiJAMA (217.1 h, 40.62M tokens) is listed in Moonbeam (M)'s pretraining corpus, and Table 2 evaluates on PiJAMA30, a benchmark derived from PiJAMA. The paper never states that the PiJAMA30 test pieces were excluded from pretraining; the private test set described in Appendix A is used only for pretraining perplexity, not for downstream classification. Since the largest classification margin in the paper appears on PiJAMA30 (Moonbeam (M) 0.679 vs MusicBERT 0.550 and Clamp2 0.440), this is a load-bearing data-leakage risk. Moonbeam (S), trained only on LakhMIDI, reaching 0.649 is a useful partial control, but it does not resolve the status of the Moonbeam (M) number. Please verify exclusion of all PiJAMA30 test pieces from pretraining, retrain without PiJAMA, or explicitly report the LakhMIDI-only result as the supported one.
  2. [Section 5.2, Tables 1-3] All experimental tables report a single run with no standard errors, confidence intervals, or significance tests. Several reported differences are small: on Emopia, Moonbeam (M) scores 0.693 vs M3's 0.715; on GPM30, Moonbeam (M) scores 0.648 vs MusicBERT's 0.630; on Pianist8, Moonbeam (S) and MusicBERT both score 0.811 accuracy. Without repeated seeds or a statistical test, the abstract claim that the model 'outperforms other large-scale pretrained music models in most cases' is not fully supported. Please add multiple seeds with error bars, or at minimum identify which differences exceed run-to-run variability.
  3. [Section 5.3, Tables 3-4] The objective controllability metrics in Table 3 show the baseline [24] exceeding Moonbeam on pitch and velocity accuracy (e.g., velocity accuracy at tolerance 0 is 0.862 for Moonbeam vs 0.997 for the baseline), while the subjective listening test in Table 4 strongly favors Moonbeam. As written, the generation claim rests entirely on the human evaluation, but the paper does not report inter-rater reliability, the exact randomization or blinding procedure, or whether the same conditions and samples were used for all raters. Please clarify the listening-test protocol, or soften the generation claim to reflect that objective condition-following is not better than the baseline.
  4. [Section 3.2.1 and Appendix F] The head-group assignment for MRA is internally inconsistent. In Section 3.2.1, G = 6 is said to come from the five music attributes plus the instrument attribute, but the piecewise definition of v_g(t) assigns g = 1 or g = 5 to onset, g = 2 to duration, g = 3 to octave, g = 4 to pitch class, and g = 6 to velocity, leaving no distinct group for instrument. Appendix F then states that the extra group is associated with the instrument and is assigned the onset value as its position. This makes the exact construction ambiguous and hampers reproducibility of the core architectural contribution. Please clarify which groups use which position decomposition and how the instrument attribute is represented in MRA.
minor comments (5)
  1. [Various] There are several typos: 'pretaining' in Appendix A, 'decompostion' in Section 3.2.1, 'the the lack' in Section 4.2, and 'Envirommental' in Appendix C. These should be corrected.
  2. [Table 1] The model names in Table 1 are rendered without spaces or delimiters (e.g., 'Moonbeamw/o FME', 'Moonbeamattn. variant'), which makes the table hard to read.
  3. [Section 4.2 and Appendix H] Section 4.2 states that models are compared at the piece level, while Appendix H.2 describes the preliminary PiJAMA30 experiment as clip-wise classification. Please clarify the relationship between the two evaluation protocols and why Table 8 is not part of the main results.
  4. [Table 3] The baseline row in Table 3 reports 'N/A' for test perplexity because the baseline uses a different tokenizer. A sentence explaining that perplexity is not comparable across tokenizers would help avoid misinterpretation.
  5. [Abstract and Section 6] The Github repository is mentioned in the abstract and conclusion, but no URL is given in the manuscript text; please include the link.

Circularity Check

0 steps flagged · score 1.0 of 10

No significant circularity: the FME self-citation is backed by in-paper ablations, MRA is derived from RoPE, and the benchmark claims are external comparisons; the unresolved PiJAMA30 overlap is a data-leakage risk, not a circular derivation.

full rationale

The claimed derivation chain is modular, and each load-bearing module is tested in this paper rather than assumed from a self-citation. The tokenizer adopts FME from the authors' prior work [17] (Section 3.1: 'we extend the tokenization method introduced in [17]'), but Section 5.1 Table 1 directly compares Moonbeam with FME (test PPL 2.423) against Moonbeam w/o FME with standard embeddings (test PPL 4.216), so the contribution of the self-cited component is independently verified by the paper's own controlled ablation. MRA is derived in Section 3.2.1 and Appendix F from RoPE (Equations 1-3) by grouping attention heads along onset, duration, octave, pitch-class, and velocity axes; no fitted parameter is renamed as a prediction. The downstream classification claims (Section 5.2, Table 2) are comparisons against external baselines Clamp2, M3, MusicBERT, and CRNN, and the generation claims (Section 5.3, Table 4) are human listening tests against an external baseline; none of these quantities is constructed from a fitted parameter. The paper does cite its own prior work for the PiJAMA dataset [43] and the GAPS dataset [51], but these are data resources rather than derived results. A separate concern, which is a data-contamination risk rather than circularity, is that Appendix A Table 5 lists PiJAMA (217.1 h) in Moonbeam(M)'s pretraining corpus while Section 5.2 evaluates on PiJAMA30, a subset of PiJAMA, and the paper never states that PiJAMA30 test pieces were excluded; similarly, Section 4.1 evaluates the LakhMIDI-trained Moonbeam(S) on 'one randomly selected 5% test set of the Lakh Dataset' that may not have been excluded from training. These issues could inflate specific numbers but do not make the derivation equivalent to its inputs by construction, so the circularity score remains low.

Assumptions & free parameters 3 free parameters · 4 assumptions · 0 invented entities

The model's central behavior depends on the rotary embedding math (RoPE), the choice of musical attributes as positional dimensions, and the hand-set theta bases; the instrument group's assignment to onset is ad hoc. No new physical entities are introduced.

free parameters (3)
  • MRA theta base values (per-dimension) = onset=199999, duration=1031, octave=19, pitch=20, velocity=131
    Hand-set rotary frequency bases for each music attribute (Table 6, Appendix D); these control how relative distances are encoded and are not learned or derived.
  • Time quantization interval and max timeshift/duration thresholds = 10ms; max 10240ms (S) / 40960ms (M)
    Appendix E: quantizing to 10ms and discarding files exceeding thresholds defines the token vocabulary and data filtering; chosen by hand.
  • Sliding window lengths for classification = 1200 (PiJAMA30), 900 (Pianist8), 130 (Emopia), 1200 (GPM30)
    Appendix H: window length empirically set to half mean sequence length; affects training segments and results.
assumptions (4)
  • standard math Rotary position embeddings preserve relative positions under inner products
    MRA derives from RoPE [22]; used in Section 3.2.1 and Appendix F.
  • domain assumption Relative musical attributes (onset, duration, octave, pitch class, velocity) are the relevant inductive biases for symbolic music modeling
    Motivated by prior perceptual and modeling work [13,17,18,19,20,21]; asserted in Section 1 without new evidence.
  • ad hoc to paper The instrument attribute can be encoded in a continuous rotary space by using onset as its position
    Appendix F assigns the extra attention head group for instrument to the onset value, an arbitrary choice for a categorical variable.
  • domain assumption Absolute onset inputs avoid the need for the model to learn arithmetic over timeshifts
    Relying on [37] (Aria-MIDI); stated in Section 3 without testing in this paper.

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Cite this review

Pith. "Pith review of Moonbeam: A MIDI Foundation Model Using Both Absolute and Relative Music Attributes." pith.science (2026). https://pith.science/paper/K6F35A2S

@misc{pith2026250515559,
  author       = {Pith},
  title        = {Pith review of: Moonbeam: A MIDI Foundation Model Using Both Absolute and Relative Music Attributes},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/K6F35A2S}},
  note         = {Machine review of arXiv:2505.15559}
}
read the original abstract

Moonbeam is a transformer-based foundation model for symbolic music, pretrained on a large and diverse collection of MIDI data totaling 81.6K hours of music and 18 billion tokens. Moonbeam incorporates music-domain inductive biases by capturing both absolute and relative musical attributes through the introduction of a novel domain-knowledge-inspired tokenization method and Multidimensional Relative Attention (MRA), which captures relative music information without additional trainable parameters. Leveraging the pretrained Moonbeam, we propose 2 finetuning architectures with full anticipatory capabilities, targeting 2 categories of downstream tasks: symbolic music understanding and conditional music generation (including music infilling). Our model outperforms other large-scale pretrained music models in most cases in terms of accuracy and F1 score across 3 downstream music classification tasks on 4 datasets. Moreover, our finetuned conditional music generation model outperforms a strong transformer baseline with a REMI-like tokenizer. We open-source the code, pretrained model, and generated samples on Github.

Figures

Figures reproduced from arXiv: 2505.15559 by the authors.

Figure 1
Figure 1. Moonbeam Model Architecture. recently, we have seen an increasing trend to represent symbolic music in ABC format as text [1, 2], modeled directly with LLMs. The transformer backbones used in symbolic music modeling can be broadly classified into two categories: the standard transformer decoder [28–30] and its variants (e.g., Transformer-XL [31] and linear transformer [32]), as used in [7, 8, 10, 14, 16, 26]; and th… view at source ↗
Figure 2
Figure 2. Moonbeam Finetuning Architecture. 3.2.2 GRU Decoder and the Training Objective At each time step, the transformer outputs a single tensor, which represents a latent representation for generating the next event at time step t. To decode all attribute tokens, this tensor is used as the initial hidden state of a GRU, which then sequentially decodes all 6 attributes: (∆ot, dt, octt, pt, it, vt). The main reason for deco… view at source ↗
Figure 3
Figure 3. Distribution of the GPM30 dataset. H.3 Construction of the GPM30 Dataset for Composer Classification Following [43], we construct a smaller subset of the Giant Piano MIDI (GPM) dataset [45] for our composer classification task. We first filter the GPM dataset and only keep the data with a sequence length shorter than 4096. We then sort the filtered dataset by the number of pieces per composer and select the top 30 c… view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: Two questions designed to filter for qualified participants during the listening test. [PITH_FULL_IMAGE:figures/full_fig_p019_4.png]
Figure 5
Figure 5. Figure 5: Listening test interface. 20 [PITH_FULL_IMAGE:figures/full_fig_p020_5.png]

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Forward citations

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Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.