Bryan "Brain" Mantia is a former drummer for Guns N' Roses, best known for his work with Primus and Buckethead. He joined Guns N' Roses in 2000, at the insistence of Buckethead, who was also a member. During his time in the band (which would actually outlast Buckethead's), he appeared on two tours, co-wrote two songs on Chinese Democracy, and can be heard drumming on every track on the album except for the title track. Although he stopped touring with the band in 2006, he continues to work with them in the studio.
- With Guns N' Roses
- (2008) Chinese Democracy