GTA may refer to several artists:
1) a hip-hop group from Oxford - U.K. Formed of Junior Doctor Chima Anya and Ineff, established in 2004 - they consider themselves "Hip-hop's last chance" .
2) Breakbeat and jungle project of DJ Uncle Noah. Originally named "DTA" to stand for 'Davis Techno Alliance' - an homoage to DJs Jeyson and Marcone/Hannibal Selecta who Uncle Noah met in Davis, CA. The project was renamed "GTA" upon settling in southern California.
3) Hard house artist.
It may also refer to a popular video game soundtrack. If so please fix your tags.