The video is kind of odd, Seems like an excuse to get some crazy camera shots of the musicians. Doesn't really help sell the app at all, I would much rather have watched a shorter, more to the point promo video.
Other than that, the app looks nice!
Other than that, the app looks nice!
Cut it down, focus on why we should care about yet another social app.
A video doesn't have to be a features list. It has to tell a story.
(And it doesn't hurt that I really do like The Piano Guys!)
The video made me install the app on my Iphone. And I like your app represented on white iphone better than on black (as seen on your landing page)
But I'm not a designer so I didn't have any expectations from article or video. It was just fun and nice teaser for app for me.