Idea for the music...

Pick Seek and Destroy to start your game (or whatever song). Song starts from the beginning. You get some kind of award for keeping the ball alive long enough to hear the whole song. Too long without hitting a switch (holding the ball) and no award. Maybe you get 2 "time" warnings for hitting no switches before you're disqualified for the award.

If you complete the song, just have the cool riff from the beginning of the song (or cool music only section of whatever song) loop for the rest of your ball.

NEVER start the song over like it's doing now. Have the song continue from where it was when you drained or started a MB or mode or whatever, or just have the riff play for the rest of your game after your first drain.

If you get ball 1 award for keeping the ball alive for the entire song, you pick a new song for ball 2. Keep the ball alive for the whole song, get a bigger award. And same for ball 3. So if you listen to 3 complete songs (long game) you get a cool award. Maybe same for Extra Balls. X amount of complete songs gets some super award.

...Just ideas