Dr. Dre Nas' "Hustlers", and several beats on Eminem's Relapse album. Soul and R&B pianist Mark Batson, having previously worked with The Dave Matthews Band, Seal and Maroon 5 has been credited as the architect of this sound. Besides Batson, Aftermath producer and understudy of Dre's, Dawaun Parker, who has named Q-Tip and J Dilla as his primary influences, is thought to be responsible for giving Dre's newest beats an East Coast feel. Dr. Dre has said that his primary instrument in the studio is the Akai MPC3000, a drum machine and sampler, and that he often uses as many as four
Dr. Dre Time's Sake", and "3 a.m." (The only track Dre did not produce was the Eminem-produced single "Beautiful".) On April 20, 2010, "Under Pressure", featuring Jay-Z and co-produced with Scott Storch, was confirmed by Jimmy Iovine and Dr. Dre during an interview at Fenway Park as the album's first single. The song leaked prior to its intended release in an unmixed, unmastered form without a chorus on June 16, 2010; however, critical reaction to the song was lukewarm, and Dr. Dre later announced in an interview that the song, along with any other previously leaked tracks from "Detox"s recording process, would