Bryan Kei Mantia, better known by his stage name Brain, is an American contemporary rock drummer and composer. He has played with bands such as Primus, Guns N' Roses, Praxis, and Godflesh, and with other popular performers such as Tom Waits, Serj Tankian, Bill Laswell, Bootsy Collins, and Buckethead. He has also done session work for numerous artists and bands. 　　Mantia has partnered with musician Melissa Reese on several projects, a composing team dubbed Brain and Melissa.In 2010, along with Buckethead, they released the multi-CD sets Kind Regards and Best Regards. Brain and Melissa composed part of the soundtrack to the video game《Infamous 2》, for which they were nominated for Outstanding Achievement in Original Composition by the Academy of Interactive Arts and Sciences awards.Other video games the duo worked on include《Playstation Home》、 《Modnation Racers》、《Twisted Metal》、《Fantasia: Music Evolved and Infamous: Second Son》. They also scored the films Detention and Power/Rangers. They have worked with music video director Joseph Kahn on several television commercials, including NASCAR, SEAT, and Qoros. In addition, they scored a commercial for Johnnie Walker Blue which featured a computer-generated Bruce Lee.They also worked on several remixes of songs off of Chinese Democracy for a planned remix album.