I saw this on Roger Ebert's Blog. It's pretty impressive! From the Youtube title, I gather this is the new world record for a LipDub. And I think one of the rules is that the record-breaker must have been filmed in one shot. And you can get an idea for how difficult it was to do in the interviews below.
And as usual, some behind the goodies.
Here's a radio interview accompanied by production stills.
