Currently buildbox only allows you to set music to worlds or user interfaces, but I think it would be great to add the ability to set music on certain scenes. Sort of like how on retro games when the character came near the end of the level, the stage music would fade out and the boss music when begin to play. Buildbox definitely needs to add that ability!
I really like your idea I never thought about it, yes you are right I hope they add it in the next version
Instead of using global music in worlds, could you use strategically placed off-screen objects in the scenes, that wake up then sleep, with the music being in idle and wake up sound settings? Difficult to set right I guess, but possibly doable?