About 14 million viewers tuned in for Sunday's broadcast of "The Beatles: The Night That Changed America," CBS announced Monday. The program featured surviving Beatles members Ringo Starr and Paul McCartney singing together again, as well as performances by artists such as Katy Perry and Imagine Dragons, and an in-depth, joint interview David Letterman conducted with McCartney and Starr. Letterman, host of CBS' "Late Show," sat for the interview with the former Beatles without a studio audience last Tuesday at the iconic Ed Sullivan Theater, home to Letterman's "Late Show" and the site of the Fab Four's historic "Ed Sullivan Show" appearance on Feb. 9, 1964. "I was just so excited," Starr said. "I mean, even coming back yesterday... I've been back 100 times. I've done the show with you, but it's like, 'Oh, I'm getting involved in all the excitement of it all then.' You know, it's not like we go around saying, 'Oh, that day.' Now, I'm here, I'm looking out the window, I'm in the plaza and all the kids were down there. And now we're back on the stage again." "It's like going back to your old school, isn't it?" McCartney said of the theater. "Yeah, well, that's right, yeah," Letterman said. "It looks little now," McCartney commented. "You thought it was huge." About 74 million people watched the Beatles' U.S. television debut in 1964, CBS said.