American musician, best known as the co-founder, bassist, and primary songwriter of the heavy metal band Mötley Crüe, being the only member to remain throughout their entire history. Prior to forming Mötley Crüe, Sixx was a member of Sister before going on to form London with his Sister bandmate Lizzie Grey. In 2000, he formed side project group 58 with Dave Darling, Steve Gibb and Bucket Baker, issuing one album, Diet for a New America. Also in 2002, he formed the hard rock supergroup Brides of Destruction with L.A. Guns guitarist Tracii Guns..
