Curtis Roy Boettcher, sometimes credited as Curt Boetcher or Curt Becher, was an American singer, songwriter, arranger, musician, and record producer from Wisconsin. He was a pivotal figure in what is now termed "sunshine pop", working with the Association, the Millennium, Sagittarius, Paul Revere and the Raiders, Tommy Roe, Elton John, Gene Clark, Emitt Rhodes, Tandyn Almer, the Beach Boys, and others.

Begin is the sole studio album released by the American music group the Millennium released in July 1968 on Columbia Records. The group first appeared after members from various Los Angeles pop groups such as the Ballroom, Sagittarius and the Music Machine decided to collaborate on an album.