We really do listen to a little of EVERYTHING. I hate Tejano or polka, but the kids will even listen to that too and I won't discourage it just because it's annoying to me. We love zydeco, blues, jazz, dixieland, golden oldies, classic, rock, some of the old metal, emo, reggae, classical, big band, swing, world beat (african and cuban especially), praise and worship, christian rock, ska, some of the pop punk stuff, some pop, classic country, new country, some rap, show tunes, "new wave" from the 80s (like The Cure or Depeche Mode), bluegrass, and children's musicians like Laurie Berkner, Music for Aardvarks, Jack's Big Music Show soundtrack, Nuttin' But Stringz, etc.
My 4 year old can hum many Mozart adagios and his favorite is the clarinet concerto. Our favorite show tunes are the from Chicago and Aida (I've taken the kids to both). We actually surprisingly really like the newer Eminem stuff but the lyrics must be the "clean version" because he curses a lot in the unedited versions....but I think he's really talented. J really likes some of those songs. I used to love Linkin Park and Rage Against the Machine (among others) but set them aside because I feel a little angry or aggressive with that kind of music, and that's not what I want to feel with my boys, and I think children are really sensitive to that. I swapped Rage for Andrae Bocelli, LOL, but I also have stopped having so much road rage. (haha) What seriously cracks me up though, as many GREAT songs as they hear on a daily basis, what their favorite songs are at the moment are "Friday" by Rebecca Black (autotuned TO DEATH, but you know, it's age-appropriate, the kid is dressed and dancing the way any NORMAL 13 year old would, it's a happy little song, and I have learned to love it when I see both my boys light up and start dancing immediately--it's AWESOME to see them break out dancing, all smiles...and while inane to the average adult, it actually makes me happy to remember that kids really don't have to have a lot of weight in their day to day life. If I didn't have kids, I'd gouge my eyeballs out with a spoon before listening to this, but because I do have young guys, I really like this song and will join in to shake my booty with them, especially in the kitchen while pouring the cereal), and "Baby" by Justin Bieber.....fortunately Bob Marley and Me First and the Gimme Gimmes are close behind. Go figure.
I must admit that I am too much of a feminist to allow certain music in the home though (thinking Pussy Cat Dolls, etc). I'm a lot more watchful of the spirit and message of a song than the genre of the song. (like rap: gangster rap or musicians like arrested development? BIG difference in the message).