With Michael Jackson gone, fans are no doubt curious about the unreleased music the King of Pop left behind. At least one of those tracks features the vocals of Ziggy Marley, according to the reggae singer. Jackson called Marley shortly after 9/11, asking him to add guest vocals to a song. Marley obliged, but never heard back, and the song, as far as he knows, was never released. "Michael called me when I was in the studio," Marley tells Spinner, "and I spoke to him and he said he really needs me to do this, and he gave me a whole thing about what it was about." Marley recorded a vocal, but never followed up. He's not sure if the song was ever completed, noting, "Somebody has to find out." Ziggy, the eldest son of late reggae superstar Bob Marley, first met Michael Jackson in 1974, when the Jackson 5 visited Jamaica. Remembering that encounter, Ziggy, now 40, says, "I was really young, and he was much older than me, but it was a big deal. It was the Jackson 5!"