St. Louis Union was a British band formed in Manchester in 1965, known for their blend of pop, soul, and rhythm and blues. The band's most significant contribution to music was their cover of The Beatles' "Girl," which reached the top 10 in the UK Singles Chart in 1966. Tony Cassidy, the keyboard player, was known for his distinctive organ sound, which was a defining feature of the band's music. Despite their brief tenure, St. Louis Union left a mark on the British music scene of the mid-60s.