When it first appeared, there was some doubt that this 2007 "collaboration" — circulated in a rough but near-identical version after Michael Jackson's death — really happened. (Members of Jackson's family are among the skeptics.) Musically, the controversy is much ado about little. "Hold My Hand," the lead single from the forthcoming posthumous Michael LP, is a modestly anthemic ­ballad about sticking by loved ones in hard times, with a melody faintly echoing Bob Marley's "No Woman, No Cry." It certainly sounds like Jackson's voice, ­although the Auto-Tune-y veneer makes it hard to be certain. Akon, meanwhile, brings a pleasant Senegalese-reggae bounce to his duet parts. A decent song? Sure. An important addition to MJ's legacy? Hardly.

“Satisfied”

Only the genius of Tom Waits could combine the subject of mortality, a reoccurring theme in his work, with wordplay that name checks both Mick and Keith, whom he calls "Mr. Jagger" and "Mr. Richards," and the title of their magnum opus, "Satisfaction." And to show just how cool Waits really is, he even got Mr. Richards to play along, one of nine guest appearances the guitarist has made on three Waits albums. "This growling roadhouse stomp is a late-breaking response to the Stones' greatest hit," Rolling Stone said of the track.