They were known (as songwriters) mainly for their work with The Monkees. They wrote the theme song for the TV show, and one of their best singles, "Last Train to Clarksville". It was this success that convinced them to record under their own names. The first charting single was, "Out & About" in the summer of 1967, but it was, "I Wonder What She's Doing Tonight" that broke them through as singers, as it reached #8 latter that year.