There are currently (4) artists using the name "Theory" (1) UK based Drum'n'bass (Jungle) producer (2005 - current)
(2) Hip-Hop artist from Yonkers,New York, USA (1998 - current)
(3) Hybrid Rock/Metal band from New Jersey, USA (2000 - 2003)
(4) Hip-Hop/Folk/other solo artist from Brighton, UK (1994 - Current) Now "Theory 77".
(1) Discography: www.rolldabeats.com/artist/theory
Official Homepage: www.theorymusic.info
MySpace: www.myspace.com/theoryoneuk