I'm relatively tone deaf. I had an illness when I was a baby that messed up my hearing. Thus, some great music sounds is horrible to me. Generally, I don't like it when people sing.
So what I like the most is 70s Jazz/blues (not sad blues, but blues are supposed to be sad, so I don't know what to call it :P and Nintendo music.
There's very little music that was created after I was born that I like.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS