The Funk Brothers were a group of Detroit-based session musicians who performed the backing to most Motown recordings from 1959 until the company moved to Los Angeles in 1972. They are considered one of the most successful groups of studio musicians in music history. The Funk Brothers played on Motown hits such as "My Girl", "I Heard It Through the Grapevine", "Baby Love", "Signed, Sealed, Delivered I'm Yours", "Papa Was a Rollin' Stone", "The Tears of a Clown", "Ain't No Mountain High Enough", and "Heat Wave".