README.md

metadata

pretty_name: ALIGN Dataset
task_categories:
  - audio-classification
tags:
  - music
  - clarinet
  - musicxml
  - music-performance
  - error-detection
  - synthetic
  - alignment
size_categories:
  - 10K<n<100K

ALIGN Dataset

Synthetic Bb clarinet practice bundles for ALIGN / MusicEval: a clean MusicXML score paired with a SoundFont performance that contains planted faults. Gold labels are score-part melodies (schema 1.2), not only wall-clock intervals.

The clean score stays correct. Only the synthesized performance is wrong.

Splits

Samples are packed into zip shards (250 clips each) so the Hub stays within file-count limits.

Folder	Samples	Source scores
output/part_XXXX.zip	12,000	Procedural original clarinet scores
output_2k_rawdata/part_XXXX.zip	2,104	Random measure windows from uploaded RawData/Score MusicXML

manifest.json lists which sample ids sit in each shard.

After unzipping a shard you get one directory per clip, for example synth_gen_0042/:

File	Role
verified_score.musicxml	Clean notation (ground truth)
performance_score.musicxml	Errored (and possibly repeated) render source
reference_audio.wav	Clarinet render of the clean score
performance_audio.wav	Clarinet render with planted errors
reference_audio.mid / performance_audio.mid	MIDI sent to the SoundFont
labels.json	Synthetic gold (source: synthetic, schema 1.2)
candidates.json	Auto alignment candidates
alignment.npz	DTW alignment artifacts
performance_mel.npy / reference_mel.npy	Log-mel features (22.05 kHz, 128 mels)
metadata.json	Render settings, error types, seed

Audio is sounding pitch (sounding_transpose: -2): written C sounds Bb. MusicXML and labels.json pitches stay written.

Planted errors

A clip draws 1–8 non-overlapping content errors from five equally weighted types, then often repeats the affected measure(s):

Type	What changes in the performance
wrong_note	±1 or ±2 semitones, or a squeak (MIDI C6–A7)
missed_note	Written note replaced by a rest
extra_note	Split a note; insert a neighbor or squeak
intonation_error	Pitch bend 40–80 cents on 1–4 notes
rhythm_error	Late/early start or end, tempo change, or uneven durations

Repetition is applied after content errors (usual case) or as a standalone replay of a sounding measure. A silent 0.2–1.0 s gap is inserted before the copy. Repeated-pass copies of content labels are not gold.

Melody gold is a contiguous run of clean-score notes (score_part + pitches) with 1–2 notes of pad on each side.

Loading

from huggingface_hub import hf_hub_download
from zipfile import ZipFile
from pathlib import Path
import json

zip_path = hf_hub_download(
    repo_id="LapisLa2uli/ALIGN_Dataset",
    filename="output/part_0000.zip",
    repo_type="dataset",
)
out = Path("align_samples")
with ZipFile(zip_path) as zf:
    zf.extractall(out)
sample = next(p for p in out.iterdir() if p.is_dir())
labels = json.loads((sample / "labels.json").read_text(encoding="utf-8"))
print(sample.name, len(labels["labels"]))

Notes

• Render: tinysoundfont + FreePats clarinet SoundFont; MIDI via music21.
• Official synth eval in ALIGN is contiguous pitch-list containment F1, not timestamp IoU.
• pipeline.log files are omitted from the upload (they contain local machine paths).