Music transcription.

1. Install pretty_midi: https://github.com/craffel/pretty-midi
2. Install fluidsynth: brew install fluidsynth pkg-config
3. Install pyfluidsynth: https://github.com/nwhitehead/pyfluidsynth
4. Install librosa: pip install librosa
5. Download data: 
   - Lakh Midi Dataset: https://colinraffel.com/projects/lmd/
   - MAPS Dataset: https://amubox.univ-amu.fr/index.php/s/iNG0xc5Td1Nv4rR
6. Install bazel: brew install bazel
7. Install timidity: brew install timidity

Links and Info.
- Magenta: https://github.com/tensorflow/magenta
- bazel import path issue: build --noexperimental_python_import_all_repositories
- FFT and CQT Explanation: https://www.youtube.com/watch?v=Cl-m4X3rwac