"Captain" Kirk Douglas Amercian Guitarist Plays with the hip hop band The Roots. Joined the Group in 2003 Also has A Rock & Roll band in the works. A guitarist is a musician who plays the guitar. ... The Roots, also known as The Legendary, The Fifth Dynasty and The Foundation, are an influential, Grammy winning Philadelphia-based hip hop group, famed for a heavily jazzy sound and live instrumentation. ... Rock and roll (also spelled Rock n Roll, especially in its first decade), also called rock, is a form of popular music, usually featuring vocals (often with vocal harmony), electric guitars and a strong back beat; other instruments, such as the saxophone, are common in some styles. ...