David Thomas Mason is an English singer-songwriter and guitarist from Worcester, who first found fame with the rock band Traffic, and went on to play and record with many notable pop and rock musicians, including Paul McCartney, George Harrison, the Rolling Stones, Jimi Hendrix, Eric Clapton, Michael Jackson, David Crosby, Graham Nash, Steve Winwood, Fleetwood Mac, Delaney & Bonnie, Leon Russell, and Cass Elliot.

Traffic were an English rock band formed in Birmingham in April 1967 by Steve Winwood, Jim Capaldi, Chris Wood and Dave Mason. They began as a psychedelic rock group and diversified their sound through the use of instruments such as keyboards, sitar, and various reed instruments, and by incorporating jazz and improvisational techniques in their music.