Question: Which artist who contributed to R Kelly's "Double Up" album began his solo career in 2000 ?
Sentence (from "Double Up (R. Kelly album)"): The album features the contributions with guest appearances and also the productions, which was handled by R. Kelly, alongside with Swizz Beatz, The Runners, Snoop Dogg, Khao, Nelly, Chamillionaire and Polow da Don.
Relevant evidence: Yes