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
GRAMMYs Announce Levon Helm Tribute With Elton John, Mumford & Sons, Zac Brown

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