There's an interesting tension in your proposition - mindfulness meditation is at least partially about growing your self-awareness (awareness of your internal processes), but social situations tend to make some people self-conscious (aware of their external presentation). Combine that with up-tempo music and I would've thought that kind of environment would make it difficult to attain present awareness. Have you run into this as a real (rather than theoretical, like in my head!) issue, and if so how do you avoid/address it?

Sounds like a great proposition though - anything that bring more people into the meditation fold sounds like a positive to me.