John Benson Sebastian (born March 17, 1944) is an American singer, songwriter and musician who founded the rock band The Lovin' Spoonful. He made an impromptu appearance at the Woodstock festival in 1969 and scored a U.S. No. 1 hit in 1976 with "Welcome Back."

Sebastian was inducted into the Rock and Roll Hall of Fame in 2000 as a member of the Lovin' Spoonful.

Source: Wikipedia (https://en.wikipedia.org/wiki/John_Sebastian)