Yup... biiiiiig fans of music around here, even just for happy background noise.
I will put on the radio, but I am careful about what station. A lot of the "cool" stations that play top 40 hits have taken to not editing (or at least not the way I would!). I find the country station good, or our local smaller station.
We also listen to music on our satellite TV stations. If we want to have a dance party, I put it on the "kids" station and turn it waaaaay up. They love it, because the screen goes blank and they can see themselves dancing! Too cute. Sometimes I will just have it on quietly, too.
At naptime, I will listen to the satellite stations also, depending on what mood I am in, haha. There is a really relaxing "nature" one, for when I feel like we need some calming down in the house. Or jazz, classical, anything current, etc.
If you are looking for CDs; WalMart or your other stores will definitely have them. You can buy the Wiggles, Raffi, all your basics. Or compilations. And don't forget the library!! It's a good way to find out if it's a CD/ group that the kids will like.