Jimmy Fallon debuts Monday as 'Late Night' host (AP)

An hour earlier on CBS, "Late Show with David Letterman" was kicking off some musical excitement of its own: the first of a full week of performances by the superstar band U2 . In an unprecedented weeklong booking by "Late Show" (airing at 11:35 p.m. EST), U2 is promoting its new album, "No Line on the Horizon." "It will be interesting to see if they can make it past Wednesday night," Letterman said on Monday's show.

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U2's four members also pitched in for some comedy. Letterman said viewers shouldn't get the impression that these are pretty-boy rock 'n' rollers — they're willing to lend a hand if someone needs some help. Then the camera switched to a shot of U2 shoveling snow outside the Ed Sullivan Theater . Later in the show, U2 performed its new song "Breathe." In his debut monologue, Fallon joked about opening-night jitters with a reference to the weather.

Full Story: Jimmy Fallon debuts Monday as 'Late Night' host (AP)