The 52nd annual Grammy Awards took place at the Staples Center in Los Angles last night (January 31). While pop stars like Beyonce Knowles and Taylor Swift scooped a record amount of awards, there were more losers than winners in the rock world.Silversun Pickups lost out to the Zac Brown Band in the Best New Artist category, Bon Jovi lost out to The Black Eyed Peas for Best Pop Performance By A Duo Or Group With Vocals, Steve Vai lost out to Jeff Beck in the Best Rock Instrumental Performance category, Death Cab For Cutie lost out to Wolfgang Amadeus Phoenix for the Best Alternative Music Album award and both the True Blood and Twilight soundtracks lost out to the Slumdog Millionaire soundtrack in the Best Compilation Soundtrack Album For Motion Picture, Television Or Other Visual Media and the Best Song Written For Motion Picture, Television Or Other Visual Media categories.However, while Green Day lost out to The Kings Of Leon in the Best Rock Performance By A Duo Or Group With Vocals and the Best Rock Song categories, their latest album, 21st Century Breakdown, went on to clinch the Best Rock Album award. While AC/DC’s War Machine fended off tough competition from Alice In Chains, Linkin Park, Metallica and Nickelback to scoop the Best Hard Rock Performance gong. Judas Priest walked away with the Best Metal Performance award for Dissident Aggressor and Brendan O'Brien – the man who twiddled the knobs on AC/DC’s Black Ice, Mastodon’s Crack The Skye, Pearl Jam’s The Fixer and Killswitch Engage’s latest self-titled album – was named Producer Of The Year.