Grammys 2012: Show-stopping performances
Grammys this year witnessed some unforgettable performnaces by Sir Paul McCartney, Rihanna, Katy Perry, Alicia Keys and others.
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The Beach Boys in their first performance together in more than 20 years, The Boss on stage, Paul McCartney, Adele, Katy Perry, Alicia Keys, Rihanna and Chris Brown - the Grammys this year witnessed some unforgettable moments - including the poignant tribute to Whitney Houston by Jennifer Hudson.
