"Groovin" is a single released in 1967 by the Young Rascals that became a number-one hit and one of the group's signature songs. Written by group members Felix Cavaliere and Eddie Brigati and with a lead vocal from Cavaliere, it is indeed a slow, relaxed groove, based on Cavaliere's newfound interest in Afro-Cuban music. Instrumentation included a conga, a Cuban-influenced bass guitar line from ace session musician Chuck Rainey, and a harmonica part, performed first for the single version by New York session musician, Michael Weinstein, and later for the album version by Gene Cornish.