There is more than one artist under the name of Rhythm on last.fm.
1) The solo project of multi-instrumentalist William Bembridge, based in the UK. The debut album Attitude & The Eyebrows was released May 2010.
2) The Christian rock/soul band from Dallas, TX. They relesed their debut album, The Forward Concept in 2005.
3) A Jazz band, who released Sumkyndajazz in 2008.
4) A solo female R&B singer from LA, who released Here & Now in 2008.
5) A 1970s funk/soul band on the RCA label. The band released "Rhythm" in 1976, a rare LP arranged by 70s superb arranger and composer Bert de Coteaux.