Bassist Mark Smith was found dead in his London apartment Monday, Nov. 2, when he failed to turn up for a gig. The 49-year-old made a career out of playing as a session and touring musician for popular acts such as Roxy Music, Bryan Ferry, Robbie Williams and David Gray. The cause of death is currently unknown.

Born in 1960, Smith got his start with the '70s British band Kokomo when their bassist went on tour with Roxy Music. While most session musicians remain in the background, their contributions are often heralded and it's no exception in Smith's case. Speaking with Music Week producer Robin Milar described Smith as a "true unsung heroes. Mark was one of the great people and players. He was one of those guys who never pushed himself forward, but was a great all round musician -- a real musicians' musician."

Most recently, Smith had performed with the Waterboys and the Futility Orchestra. According to his website, he has also recorded with Joe Cocker, George Michael, Mickey Hart, Lionel Richie, Neneh Cherry, Van Morrison and Jarvis Cocker among many notables.