The Turtles are a U.S. rock group led by vocalists Howard Kaylan and Mark Volman. The band became notable for several Top 40 hits beginning with its cover version of Bob Dylan's "It Ain't Me Babe" in 1965 that reached the Billboard Top Ten, and was the title track to the band’s first album. The group scored its biggest and best-known hit in 1967 with the song "Happy Together." "Happy Together," both their biggest hit and their signature song, signaled a turning point for the Turtles and for Chip Douglas, who provided the arrangement. The single replaced the Beatles' "Penny Lane" at number one on the Billboard Hot 100 in the spring of 1967.