Tandyn Douglas Almer was an American songwriter, musician, and record producer who wrote the 1966 song "Along Comes Mary" for the Association. He also wrote, co-wrote, and produced numerous other songs performed by artists such as the Beach Boys, the Purple Gang, the Garden Club, and Dennis Olivieri. In the early 1970s, he was a close friend and collaborator of Brian Wilson, co-writing the Beach Boys' singles "Marcella" and "Sail On, Sailor".
His most prominent achievement was writing the 1966 U.S. Top 10 hit "Along Comes Mary" for the Association. Claudia Ford, wife of Association producer Curt Boettcher, claimed that Almer wrote "Along Comes Mary" as a slow song. Boettcher helped Almer arrange the tune, sang the vocal on the demo and accelerated the tempo. That version, as provided to the Association, became the group's breakthrough single from their debut album, which Boettcher produced. The two also co-wrote "Message of Our Love", another song on the same album. After the success of "Along Comes Mary", Almer was featured alongside Frank Zappa, Graham Nash, Roger McGuinn, and Brian Wilson on , a 1967 CBS News documentary presented by Leonard Bernstein. Almer's sole commercial release under his own name was "Degeneration Gap", a single released by Warner Bros. in 1969. In 1970, he produced the Dennis Olivieri album Come to the Party. While a songwriter for A&M Records in the early 1970s, he was introduced to and became friends with Wilson; in a 2010 interview, Wilson characterized Almer as his "best friend". According to musician Joseph Deaguero, who introduced Almer to Wilson, "Everyone thought he was going to be the next Dylan or Elton John. Tandyn was totally an eccentric, but he was in a league of his own. You listen to his music and say, 'God, this guy was really good.'" Although they ultimately became estranged owing to a variety of factors, the two collaborated in the early 1970s on several projects, including an aborted album of re-recorded Beach Boys songs with more topical lyrics for A&M and the Beach Boys singles "Marcella" and "Sail On, Sailor". Almer invented a water pipe called the Slave-Master, described by Jack S. Margolis and Richard Clorfene in A Child's Garden of Grass as "the perfect bong". He moved to the Washington metropolitan area in the mid 1970s to work on a film soundtrack; after the project fell through, Almer lived there for the remainder of his life. Although he wrote songs for the annual Hexagon satirical revue and several fake books, he mainly subsisted on "intermittent royalty checks". His bipolar disorder often resulted in "erratic mood swings" and abject insomnia; according to Thomas Bernath, "He used to tell me the music got better the longer he stayed awake. He didn’t feel like playing until he had been awake for two or three days." Almer continued to record prolifically, amassing a private collection of hundreds of tapes.