You can measure a singer's place in the pop-star pecking order by the quality of the Max Martin/Shellback song she releases. For Xtina, the news ain't good. "Your Body" is a sluggish and nearly hookless hookup anthem, apparently dredged from that part of the Stockholm harbor where the Swedish hitmakers toss their D-list material.

Listen to "Your Body":

“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.