Example:
? (transpose 'a4 1) as4 ? (transpose 69 -1) 68 ? (transpose '(c4 e g) (interval 'aug 4)) (FS4 AS4 CS5) ? (note (transpose '(60 61) '(0 4 7) )) ((C4 E4 G4) (CS4 F4 AF4)) ? (note (transpose '(0 4 7) '(60 61))) ((C4 CS4) (E4 F4) (G4 AF4))