Rock, Dance, Trance, Techno/Rave, Metal, and Classical.
Rock: I've been somewhat exposed to the Rock Genre thanks to Guitar Hero and Rock Band, but I know a lot of it thanks to my StepMania library of songs, especially by Rhapsody of Fire.
Dance: I couldn't find any genre similar to DDR's array, so I selected this. It's not like I prefer them in itself much.
Trance: The magic of it, yeah. Kind of like Blizzard likes his trance.
Techno/Rave: Japanese DJ/Ravers for the win!!!
Metal: Not Heavy Metal...
Classical/Opera: Classic Music is very majestical and bring a level of nostalgia...Something like that at least.
EDIT: By the way, I'm surprised DeathLock didn't go Grammar Nazi on the topic title, being What's
you're favorite Music genre? It suffers with the your-you're thing, and it should rather be your.
EDIT2: Redone vote.