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The Black Keys have been busy celebrating their new album Turn Blue in the Big Apple.  They were in New York on Saturday to play NBC's "Saturday Night Live."  And on Monday, they moved over to CBS to perform "It's Up to You Now" on the roof of the Ed Sullivan Theater for the "Late Show with David Letterman." 

Dan Auerbach and Patrick Carney gave fans even more from the new record and its predecessor El Camino on the "Late Show's" "Live on Letterman" webcast.