The Isley Brothers had a raw sound, best typified by Twist and Shout, their iconic hit from 1961. When they signed with Motown in 1966, Berry Gordy handed them over to
Holland, Dozier and Holland who tried to tame their sound and whiten it. This was a mistake, but it produced a song that just missed the Top 10. When their contract expired, the Isleys went elsewhere and produced some fine hits with their blacker sound in the early Seventies. This song had been intended for the Supremes.
The Isley Brothers: This Old Heart of Mine