Online concert video has been steadily building toward high-quality live streaming video, with accompanying social media interaction. “Unstaged,” a new online concert series being launched by American Express, hopes to combine all of these elements. Arcade Fire will kick off the series by streaming live a much-anticipated August 5 concert at Madison Square Garden in New York. The concert will stream live Aug. 5 at 10 p.m. Eastern on Youtube as well as Vevo and it's the first in a planned series of five live streamed concerts. The series is planning interactive features like a choice of camera angles. Kelso said another option might be having viewers vote on song requests. The largest Internet audience yet for a concert was YouTube's streaming of a U2 show in October, which was watched live by nearly 10 million.