Most of those are variable names. The rest: > Why a melody wants to land where it lands is still mostly opaque to me

> A key, its diatonic chords, a progression, those chords broken into an arpeggio one note at a time, and a melody that sticks to the scale

> Change the melody array to anything at all and it will still fit

The first part of TTLS (in C) is: C C G G A A G F F E E D D C. Let's follow the guidance of this last part and change the "melody array"; for neatness we can alphabetize it: A A C C C D D E E F F G G G. Now that you understand melody, please tell me why even though it "still fit"s it doesn't sound as nice.