In an effort to inject some added energy into the ramp-up the the Grammy Awards ceremony, sponsors turned the nominations announcements into a concert event in LA Wednesday (12/2).  The result was an awkward combination of a sit-down, stand-up affair for the celebs rounded up to attend, as well as those that performed. The misguided tradition of presenters that are clueless about the category whose nominees they announce was never more apparent than when Pop singer Katy Perry gave a look of disdain for AC/DC and rolled her eyes when she announced Eric Clapton and Steve Winwood's nods for Rock Album of the Year. Green Day was the only group Perry made it obvious she likes in the category that also included the Dave Matthews Band and U2.  We hope she is nominated next year in a category Angus Young announces.  Get the rest of the Grammy Rock story here.