---
language:
- all
task_categories:
- music-transcription
- generative-modeling
- audio-processing
- machine-learning
tags:
- midi
- lakh-midi
- maestro
- json
- music-ai
- symbolic-music
- datasets
- cleaned
- structured
- mir
- generative-models
- deep-learning
pretty_name: Lakh MIDI Cleaned JSON (44k files)
size_categories:
- 100M<n<1B
license: mit
---
# Lakh MIDI Dataset — Fully Cleaned & Structured JSON (44,129 files)

This dataset is a fully cleaned and normalized version of the Lakh MIDI Dataset.  
Each MIDI file has been parsed, validated, and converted into a consistent JSON structure with detailed musical metadata.

✔ 44,129 cleaned JSON files  
✔ instrument programs  
✔ notes, durations, velocities  
✔ tempo curves  
✔ key signatures  
✔ time signatures  
✔ tracks & channels  
✔ structural markers  
✔ file-level metadata  
✔ consistent schema across all files  

Suitable for:
- Music AI  
- symbolic modeling  
- generative models  
- audio-to-symbolic learning  
- embeddings  
- piano transcription  
- MIR research  
- supervised ML datasets  
- music information retrieval  

License: Same as original Lakh dataset (public research dataset, metadata extracted legally).  
All JSON files are derived from open-source MIDI data.

For commercial or large-scale dataset cleaning services:  


— Zeronex