NIN and QOTSA with Dave Grohl Grammy performance

These sorts of back slapping moments always suck but Nine Inch Nails and Queens of the Stone Age with Dave Grohl at the Grammy’s performing with Lindsey Buckingham from Fleetwood Mac was a must watch. Why the hell did they break for an advert half way through the performance though? Another example of pure greed ruining the arts. Thanks America, you suck.