Apache 2.0 license, unless otherwise stated/requested
https://colinraffel.com/projects/lmd/
The Lakh MIDI Dataset is distributed with a CC-BY 4.0 license; if you use this data in any capacity, please reference this page and my thesis:
Colin Raffel. "Learning-Based Methods for Comparing Sequences, with Applications to Audio-to-MIDI Alignment and Matching". PhD Thesis, 2016.
Project Los Angeles
Tegridy Code 2021