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 absence of radio airplay or major concert tours. The Federal Bureau of Investigation sent Ruthless Records a warning letter in response to the song's content. After Ice Cube left N.W.A in 1989 over financial disputes, Dr. Dre produced and performed for much of the group's second album "Efil4zaggin". He also produced tracks for a number of other acts on Ruthless Records, including Eazy-E's 1988 solo debut "Eazy-Duz-It", Above the Law's 1990 debut "Livin' Like Hustlers", Michel'le's 1989 self-titled debut, The D.O.C.'s 1989 debut "No One Can Do It Better", J.J. Fad's 1988 debut "Supersonic" and funk rock musician Jimmy Z's