Give better positive reinforcement via new high score popups.
Аfter you complete a song, you get to see if you improved over your high score. However, the highscore is computed as a sum of highscores per segment, so you often improve your highscore but don't see it! I think it's a huge miss for you guys to give positive reinforcement to people.
Possible solution could be to show a popup over each segment that you got a new high score on.
As someone who practices a lot on the same songs it would be nice to know when I'm improving :) (I bypass this problem by going to highscores where I can already see the updated value, but this is obviously cumbersome).