This tool processes MP3 files by separating them into stems (drums, bass, vocals, and other) and converting each stem into MIDI format. It uses Demucs for stem separation and Basic-Pitch for audio-to-MIDI conversion.

• Separates audio files into four stems:
  • Drums
  • Bass
  • Vocals
  • Other instruments
• Converts each stem to MIDI
• Creates a combined MIDI file with appropriate instrument assignments
• Organizes output in a clear folder structure

• Python 3.7+
• Basic-Pitch CLI tool
• Required Python packages (install via requirements.txt):
  • torch
  • demucs
  • midiutil
  • mido

1. Create and activate a virtual environment:

   python -m venv venv
   source venv/bin/activate # On Windows: venv\Scripts\activate

2. Install required packages:

   pip install -r requirements.txt

3. Download the Basic-Pitch CLI tool:

   pip install basic-pitch

1. Place your MP3 files in the data/ directory

2. Run the script:

   python stem_and_convert_new_mp3s.py

3. Find the processed files in the out/ directory. Each processed song will have its own folder containing:

   • Separated audio stems (WAV format)
   • Individual MIDI files for each stem
   • Combined MIDI file with appropriate instrument assignments

out/ song_name/ drums.wav drums_basic_pitch.mid bass.wav bass_basic_pitch.mid vocals.wav vocals_basic_pitch.mid other.wav other_basic_pitch.mid combined.mid

The combined MIDI file uses the following channel assignments:

• Drums: Channel 10 (standard MIDI drum channel)
• Bass: Channel 1 (Electric Bass)
• Vocals: Channel 2 (Voice Oohs)
• Other: Channel 3 (Acoustic Grand Piano)

• The script only processes new MP3 files that haven't been processed before
• Existing output files will not be overwritten unless the processing is forced
• Processing time depends on the length of the audio files and your computer's specifications