Source Code: https://github.com/tsoding/haskell-music
Note Frequency Math: https://pages.mtu.edu/~suits/NoteFreqCalcs.html
Chapters:
0:00 Producing First Sounds
19:03 Frequency in Hertz
28:06 Semitones
34:10 Attack-Release
43:32 Tempo
46:06 Making Music