Music is everywhere at Burning Man. Indeed, sometimes when you're trying to sleep, you might wish it wasn't! Bring ear plugs!
The majority of the music out there, especially at the big sound camps (theme camps devoted to music) and on the big art cars, is electronic music.
Good places to find non-electronic music are less predictable but include Jazz Camp (always on Rod's Road or within Center Camp) and at Center Camp itself, where music is typically acoustic.
Art cars bring traveling sound systems to the playa, and some of them are pretty incredible.
Rockstar Librarian puts out a lineup of acts at major camps and releases it before the event every year, but not much before! Print out a couple copies and bring them with you.
But, don't worry about finding your favorite DJ - let the moment take you. There's music everywhere and if you don't like what you're listening to, walk 50 feet and you'll be listening to something else.