The Isley Brothers ( /ˈaɪzliː/ yz-lee) are a highly influential, successful and long-running American music group consisting of different line-ups of six brothers, and a brother-in-law, Chris Jasper. The founding members were O’Kelly Isley, Jr., Rudolph Isley, Ronald Isley and Vernon Isley.
Starting their careers in the gospel performing circuit in the early 1950s, they eventually crossed over to secular music first finding modest success in doo-wop until the release of their first million-selling hit, “Shout”, in 1959. After several flops resulted in them being dropped from their record label, they found success again with sixties hits such as “Twist and Shout”, later covered successfully by The Beatles and the Motown hit, “This Old Heart of Mine (Is Weak for You)” in 1962 and 1966 respectively. The group didn’t find success again until the end of the decade when their 1969 single, “It’s Your Thing”, (with Ernie Isley on bass guitar) was released. The song brought them success in the then-fledgling funk genre.