EDM:
Eric Prydz, a.k.a Pryda, a.k.a Cirez D
Kaskade
Tiesto
Laidback Luke
SHM, Axwell being my favorite of the three.
And Deadmau5 even though I am not a fan of his music. He is a musical genius.
..And Afrojack. He was my favorite producer no doubt, now he has become very repetitive and has been caught up in the partying.. with Paris Hilton.. EWW.
Rap:
RZA
Dr. Dre
DJ Yella
Hypnotized Minds
DJ Paul
DJ U-Neek
Other:
George Clinton (RHCP, various rappers such as Tupac Shakur, Outkast, Wu-Tang)
Alan Parsons (Pink Floyd, Beatles)