St. Louis Union were a 1960s, short-lived, freakbeat rock band from Manchester, England, who formed part of the mod rock scene. They were formed by singer Tony Cassidy, guitarist Keith Millar, tenor saxophone/flute player Alex Kirby (left 1965; replaced by Lenni Zaksen and Bernie Brown), keyboardist David Tomlinson, bassist John Nichols and drummer Dave Webb.
They formed initially as The Satanists and then, after they changed their name, they won a Melody Maker beat contest in 1965, leaving a fledgling The Pink Floyd (later known simply as Pink Floyd) in a lower placing, and obtaining a recording contract with Decca Records.Their first single, a cover of the Beatles song "Girl", was a success in the UK Singles Chart, where it reached #11 in February 1966. The single also had an American release on Parrot. The band were popular in the Manchester area.
However, after "Girl", there were no more hits, despite singles such as "Behind The Door" and "East Side Story" being released. They performed "East Side Story" plus "Things get better" and "Don't worry girl", on Top of the Pops on 1 November 1966 plus two songs in the film The Ghost Goes Gear also in 1966. The band split up in 1967.