TODO 367 B

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  1. Add helper functions to convert output of advancing_progression into lilypond and abc markup.
  2. # Exercise 1
  3. Make a progression of three-voice chords where the top voice alternates between two notes with every change, the second voice
  4. alternates between two notes every two chords, and the lower voice alternates between two notes every three chords.
  5. # Exercise 2