“The Beatles: Rock Band” has produced more buzz than any video game since the last “Grand Theft Auto.” When Paul McCartney and Ringo Starr took the stage at Microsoft’s Xbox press conference at E3 this summer, they were greeted with a standing ovation. Gamers, then, already know and love the Fab Four, so the idea that “The Beatles: Rock Band” will introduce their music to a new audience is nonsense. A more important question: Will the more technophobic members of the Beatles’ massive fan base finally be motivated to pick up a game controller?