 He received his first formal credit on 50 Cent’s "Get Rich or Die Tryin"' soundtrack, and contributed to several songs on Busta Rhymes' number 1 album, "The Big Bang", as well as Jay-Z's return record, "Kingdom Come".Parker co-wrote the number 1 single, "Crack a Bottle", by Eminem, Dr. Dre and 50 Cent, and co-produced nearly every track on "Relapse".On October 20, 2010, Parker released his first single, Lost, co-produced by Dr. Dre and featuring Phil Beaudreau.