Keith Relf (born March 22, 1943, Richmond upon Thames, Surrey; died May 14, 1976, London) is best known as the lead singer and harmonica player of the Yardbirds. After the Yardbirds broke up, Relf was involved in the duo Together (with fellow-Yardbird Jim McCarty), the groups Renaissance (which included his sister Jane Relf) and Armageddon. He also produced a number of tracks for the Acoustic based Amber, for Saturnalia, and for Medicine Head, with whom he also played bass.