Despite the controversy that's surrounded his name since the '90s, R. Kelly has remained among the most acclaimed and successful talents in the music business. Known for songwriting and producing as well as singing, the self-proclaimed "Pied Piper of R&B" is currently touring to support Untitled, which came out earlier this week. (This is also Kelly's first tour since his 2008 acquittal on child-pornography charges.) His first single, a duet with Keri Hilson called "Number One," is exactly what you might expect from Kells: sexual swagger over a radio-ready R&B instrumental. Also performing will be Pleasure P (formerly of Pretty Ricky) and newcomer K. Michelle.