Hey, people !   I´m doing a function to extract the complementary set of notes. For example:   1) Specify a set of notes, like a chord, Dm7   (setf note-list '(d5 f5 a5 c6))   Specify a tonality, like Cmajor or D dorian (same notes) (expand-tonality '(c5 major))   Now, I want a function that gives me all the other available notes from the mode, except the chord tones (the first set of notes).   So, this function gives me exactly what