Having transitioned into a more grown-up sound, Beyoncé has gotten conceptual on us: Her third album offers two discs, a collection of heartfelt ballads credited to Beyoncé and a danceable set credited to "Sasha Fierce," the pop diva's more brash, lady-empowering alter ego. Though some of the slow songs have thoroughly memorable tunes, the lyrics are full of bland self-affirmation and saggy lines like "You're everything I thought you never were." But the "Sasha" disc boasts Beyoncé's most adventurous music yet: She rides frothy techno on "Radio," turns out modal-sounding hooks over 808 bass on "Diva" and juices the eerie, Nine Inch Nails-style beats of "Video Phone" with lines like "Press 'record' and I'll let you film me." Another plus: The girl who blew up going all melismatic has never sung with more restraint than she does on Sasha.

“Time to Pretend”

Listening to MGMT’s breakthrough song, one might interpret it as being about the excesses of rock stardom, but it’s actually about the duo’s pet praying mantis. Ben Goldwasser and Andrew VanWyngarden told Rolling Stone they got the idea from the insect's jerky movements. The mantis died, but the two bandmates kept the egg sack and allowed the hundreds of eggs to hatch. “We tried to name them all, but they died after a day,” said Goldwasser, with VanWyngarden chiming in, “But the praying mantis dance inspired us.”