<p>John Mayer, left, and Keith Urban perform at the night that changed America: a Grammy salute to the Beatles, on Monday in Los Angeles.</p>
January 31, 2014
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January 31, 2014 8 p.m.
Stars line up to pay tribute to The Beatles
LOS ANGELES - There's an easy way to give pop music's most performance-hardened stars a case of the butterflies: Ask them to perform in front of The Beatles.