DigiFest NYC: Pentatonix + Allstar Weekend + Tyler Ward + Kina Grannis + The Gregory Brothers

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.