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Lady Gaga, Zac Brown Added To GRAMMY Sinatra TributeHarry Connick Jr. and Celine Dion have also been added to the special.

Foo Fighters & Zac Brown Cover Black Sabbath's 'War Pigs' on 'Letterman': WatchThe Foo Fighters kicked off their week-long residency at The Late Show with David Letterman by wearing their metal heart on their sleeves.

Elton, Mumford Lead Levon Helm GRAMMY Tribute