(define (process-inversion complete-chord)
"Take out inversion from COMPLETE-CHORD, and put it at the bottom.
Return (INVERSION . REST-OF-CHORD).
Side effect: put original pitch in INVERSION.
If INVERSION is not in COMPLETE-CHORD, it will be set as a BASS, overriding
(define (process-inversion complete-chord)
"Take out inversion from COMPLETE-CHORD, and put it at the bottom.
Return (INVERSION . REST-OF-CHORD).
Side effect: put original pitch in INVERSION.
If INVERSION is not in COMPLETE-CHORD, it will be set as a BASS, overriding