Five guys plus one piano equals one pretty cool version of 'What Makes You Beautiful' by One Direction.

The Piano Guys (Jon Schmidt, Steven Nelson) say the idea started purely by accident when someone plucked a piano string. According to their website, they are all "poster children for ADHD" and they all began banging out a beat, plucking strings and hitting keys.

Behind-the-scenes guys Paul, Tel, and Al joined in, and the video that was created is a downright cool version.  You might have a hard time believing it was created entirely with a single piano.