Quoted from flynnibus:?
Song bonus should just be the song jackpot but collected mid MB by having the song being played align with the jackpot progress for that MB. Based on the song matching the album... matching the tour.. etc.
What makes you say it doesn't reset? AFAIK it's just whatever the current song jackpot value is.
He means that you still have the song jackpot to collect even after collecting a song bonus.