As the old saying goes...
I hear a lot of people in game and on the forums complaining about the in-game music that is stuck in their head. But one thing I've noticed is when I'm on a pug that is doing this the teams last longer for more missions. I also see this in AE farms where it's no longer possible to just be a sitter, you either have to be a hitter or talker to participate. Music easily fills the hole for this. I hear more comments about how much they had fun and the time goes by fast when you're having fun. Has the symphony set made a positive experience to your teams yet?