2001 (Dr. Dre album) were later cut from the final track list. The tracks have been leaked later on several mixtapes, including "Pretox". The album's production expanded on that of "The Chronic", with new, sparse beats and reduced use of samples which were prominent on his debut album. Co-producer Scott Storch talked of how Dr. Dre used his collaborators during recording sessions: "At the time, I saw Dr. Dre desperately needed something. He needed a fuel injection, and Dre utilized me as the nitrous oxide. He threw me into the mix, and I sort of tapped on a new flavor with my whole piano
Dr. Dre was introduced to fellow Pittsburgh native Melvin "Mel-Man" Bradford. At this time, he also switched from using the E-mu SP-1200 to the Akai MPC3000 drum kit and sampler, which he still uses today. Beginning with his 1996 compilation Dr. Dre Presents the Aftermath, Dre's production has taken a less sample-based approach, with loud, layered snare drums dominating the mix, while synthesizers are still omnipresent. In his critically acclaimed second album, 2001, live instrumentation takes the place of sampling, a famous example being "The Next Episode", in which keyboardist Camara Kambon re-played live the main melody from David McCallum's 1967 jazz-funk