Great video - I hadn't listened to the song much before watching this (I bought Prism) but I really like it! People have a lot of negative things to say about Prism but I have enjoyed it thoroughly - I have no doubt this Katy Perry era will be a long one with lots of hits. She can't sing that well live, but who cares? She still puts on a decent show, and her vocals on certain songs live sound just fine - her deeper, more emotional songs are cool and then she's got the hits like Roar that get the coins from iTunes as well.