This app was mentioned in 1 comment, with an average of 1.00 upvote
I doubt anything will work whilst in exercise mode...
this info might help with spotify though ? https://play.google.com/store/apps/details?id=com.andrewleinbach.msband.media&reviewId=Z3A6QU9xcFRPRXJYTFlkdDdING5DNjlaREM3Yk1YOE1sajZoV1JQLWVFU0pIMlY5VHpPNHE1bi1oSTUtUGRITl81SE03czlfeW90cjBILXNYcUZFTzZ4