Prior to SuperHeavy, Mick Jagger's solo career had spanned sixteen years and four studio albums (from '85's "She's The Boss" to '01's "Goddess In The Doorway"). These albums could be termed modest successes but no doubt convinced the singer not to quit his day job fronting the Rolling Stones.
Dave Stewart's major claim to fame was being one-half (with Annie Lennox) of the Eurythmics, where he played guitar and wrote songs. The band scored a number of hits in the '80s and when it ended Stewart went on to a successful career as a producer. It was Stewart who suggested that he and Jagger start a group. The other band members turned out to an accomplished, yet eclectic, blend.
Joss Stone (born Jocelyn Eve Stoke on 4/11/87) was already an immensely popular Soul singer/songwriter with CD sales in excess of 11 million. Like Jagger, she'd also done some acting.
Damian "Jr. Gong" Marley (born 7/21/78) was the youngest son of Reggae legend Bob Marley. Nicknamed "Jr Gong" (his father was known as "Tuff Gong"), Damian had been performing since he was 13 and had three Grammy Awards to show for it.
A.R. Rahman, an Indian film composer, record producer, musician and singer was born when Jagger was singing "Paint It Black" and "19th Nervous Breakdown" ('66). Prolific, he had over one-hundred film scores to his credit, including '08's Slumdog Millionaire.
That was just the combination of talents that appealed to Jagger. "We wanted a convergence of different musical styles...," he said. "We were always overlapping styles, but they were nevertheless separate."
The quartet began working, under the radar, in '09. Those sessions, and others, led to the release of the group's self-title debut in '11. "Miracle Worker" was SuperHeavy's first single.