Hi Hooktheory team,
It would be nice to add a loop button for chord progressions in chordcrush. If users try to figure the chord progression with their instrument, having a loop is very useful. I find picking up the progression with the instrument is slightly more direct, and also very useful.
I understand some chord progressions are incomplete and a loop would sound a bit weird, but still it would be useful to add, at least for the non-Youtube progressions.