Daryl Hall and John Oates, commonly known as Hall & Oates, are an American pop rock duo formed in Philadelphia in 1970. Daryl Hall is generally the lead vocalist; John Oates primarily plays electric guitar and provides backing vocals. The two write most of the songs they perform, separately or in collaboration. They achieved their greatest fame from the mid-1970s to the late 1980s with a fusion of rock and roll, soul music, and rhythm and blues.