Watch the Avett Brothers Perform "I and Love and You" on David Letterman

The Avett Brothers
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"This is the plight of the Avett Brothers fan: He must keep a stiff upper lip as his heroes trek off into the great unknown mainstream." So says our review of the Avett Brothers' superb I and Love and You, their major-label debut LP, which is out today. And that trek is coming sooner than you think, true believers, because the Brothers debuted on the Late Show with David Letterman last night to perform a stirring version of the album's eponymous single.