No man alive – well, no 15-year-old Canadian -makes ladies squeal like Justin Bieber. He's 65 inches of pure love panther, with sensitive-man bangs and a voice like Joey Mclntyre getting savagely beaten by the Auto-Tune police. On the jazzy "P.Y.T." rip "Bigger," the Bieb confesses, "I was a playa when I was little" – playa of what, Pokémon Battle Revolution? But who could deny "First Dance," where Usher drops Justin at the prom so he and his Bieblette can get to "rockin' back and forth under the disco ball"?

Key Tracks: "First Dance," "Bigger," "Love Me"

“1999”

“I don’t consider myself a great poet,” Prince told Rolling Stone. “I just know I’m here to say what’s on my mind.” In the case of the apocalyptic party anthem “1999,” he was worried about then-president Ronald Reagan’s foreign policies. The song’s melody is based on a riff borrowed from the Mamas and Papas’ “Monday, Monday,” and Prince originally envisioned the first verse with three-part harmony but later split the vocals between himself and members of the Revolution. Because Warner Bros., with whom Prince was locked in a contractual battle, owned the original’s masters, Prince rerecorded the song and appropriately released that version in 1999.