I keep music going in the classroom all day long. But not the kind of music my kids listen to on the radio or on TV. I pick up CDs which feature a variety of regional and cultural music they might not get to hear otherwise. Music with a beat. Music that's fun to listen to. Music that stimulates their little brains, like Cajun, upbeat Country and Western, and Celtic.
On the other side of the coin, when it's time to calm down and rest and relax a little, I play a nice tranquil CD.