"Sledgehammer" is a song recorded by American girl group Fifth Harmony for their first studio album, Reflection. The song was released on October 28, 2014 by Epic Records and Syco Music as the record's second single. It was written by Jonas Jeberg, Meghan Trainor and Sean Douglas, and produced by Jeberg and Harvey Mason Jr. Musically, "Sledgehammer" is a synthpop song with influences of electronic... Wikipedia