Lootpack’s 1999 debut album Soundpieces: Da Antidote ushered in a string of releases on Stones Throw centering on Madlib’s production work which would continue for a decade. His first solo work, The Unseen, under the guise of Quasimoto, came in 2000. The album was met with critical acclaim and named by Spin as one of the top 20 albums of the year. In 2001, Madlib moved away from hip hop music and began a series of releases from Yesterdays New Quintet, a jazz-based, hip hop and electronic-influenced quintet made up of alter-egos or fictional musicians played by Madlib. Over the next several years, through several record releases on Stones Throw and other labels, the growing number of pseudonyms and fictional players came to be known as Yesterdays Universe. Madlib was later invited to remix tracks from the Blue Note Records archive in 2003, which he released as Shades of Blue. In addition to the remixes, the album contained newly recorded interpretations of Blue Note originals, many of which were credited to members of Yesterdays New Quintet. Beginning with the 2007 album The Funky Side of Life by Yesterdays New Quintet spin-off group Sound Directions, the Yesterdays Universe also began incorporating additional session musicians who were not pseudonyms of Madlib. Returning to hip hop music in 2003, Madlib announced two collaborative projects. He joined hip hop producer J Dilla in a duo known as Jaylib, which released Champion Sound. Madlib then collaborated with rapper MF DOOM, known together as Madvillain. Produced by using a Boss SP-303 and a turntable, their 2004 album Madvillainy was highly anticipated and well-received, topping many critics’ year-end lists. The 2005 Quasimoto album The Further Adventures of Lord Quas met with warm reception and continued the Quasimoto tradition of using vocal samples from Melvin Van Peebles, who is credited on the album liner notes as a collaborator. Throughout the rest of the decade Madlib continued to release jazz material simultaneously with his hip hop work: Perseverance with Percee P, Liberation with Talib Kweli, Sujinho with Ivan Conti of Azymuth, his own instrumental hip hop series Beat Konducta, In Search of Stoney Jackson with Strong Arm Steady, O. J. Simpson with Guilty Simpson, and production work for artists such as Erykah Badu and De La Soul. thumb|left|Madlib and J Rocc in Cologne, Germany, in 2003

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