The Singing Mouth iPhone App French electro Band Cassius has a new App that helps you sing their song. And it gives you a way to make your friends look stupid, which is awesome. Mathieu S. top20 Community Contributor posted about a year ago Share 27 63 Tweet Email 5 Stumble Video available at: http://www.dailymotion.com/swf/xffu68_cassius. Check out more articles on BuzzFeed.com! Share on Facebook