Which band performed the theme song to the U.S. TV comedy anthology series "Love, American Style"?

The talented and proficient band that performed the theme song to the U.S. TV comedy anthology series "Love, American Style" was The Cowsills. The Cowsills are an American singing group from Newport, Rhode Island. They are six siblings noted for their professional style of performing on stage and for their way of singing upbeat and popular musical harmonies. The band was formed in the spring of 1965 by brothers Bill, Bob, and Barry Cowsill; their brother John joined them shortly thereafter.

In 1969, the band was asked and accepted the opportunity to sing the theme for the 1969 - 1974 TV series "Love, American Style". Their song was used during the entire first season of the show. The show was liked and received fan support because it used a variety of musical songs and stars who performed comic sketches about love relationships.