Just because you can rhyme booty with boobies doesn't mean you should. Still, it's not like Usher's big draw is his lyrical depth; this No. 1 hit is as light as a tube top, from its whooshy Eurodisco synths to will.i.am's Auto-Tuned cameo. That stadium-chant chorus is a brilliant dance-floor touch, though.
Top 10 Songs of Summer 2010
What makes a pop confection worth turning the volume up and rolling the windows down? TIME rates a season of singles