Did twin-sister duo Megan & Liz just not-so-quietly issue the most catchy song of the summer? "Release You," the lead single from the YouTube-bred group's forthcoming first album, certainly has a showy pedigree, with Max Martin and Shellback producing and Savan Kotecha recruited as a co-writer. But the song's power resides in Megan and Liz Mace's arresting vocal tics: After brashly attacking the verses of the breakup song with claws drawn, the duo falls back and delivers the titular lyric in a fluttering falsetto.

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