ARTURIA: https://zenodo.org/record/4680486#.Yxqc96FBxPZ
NSynth: https://magenta.tensorflow.org/datasets/nsynth
SoundFonts:
https://musical-artifacts.com/artifacts/1394
https://musical-artifacts.com/artifacts/1665
https://musical-artifacts.com/artifacts/1431
https://musical-artifacts.com/artifacts/2158