The heavy hitters of YouTube converge for mass madness in midtown. Flexing their vocal cords in the headlining slot are the winners of season three of TV's The Sing-Off, Pentatonix (the group's victory song was "Eye of the Tiger"). Then you've got pretty-boy emo popsters Allstar Weekend and California singer-songwriter Kina Grannis, whose "In Your Arms" had a springy stop-motion video featuring 288,000 jelly beans. Oh, and then there are the Gregory Brothers, whose 2010 "Bed Intruder" anthem we're always happy to hear.
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