In 2011, Calhoun played with the rock supergroup SuperHeavy with Mick Jagger, Dave Stewart, Joss Stone, AR Rahman, and Damian Marley on their debut studio album, Superheavy, and accompanied Stevie Nicks' on the album, "In Your Dreams".
Calhoun performed again with Rahman on MTV Unplugged, and appeared with Hans Zimmer, Pharrell Williams, A. R. Rahman and Sheila E. at the 84th Annual Academy Awards in 2012 [REF].