With more than one microphone, multiple singers can try out "harmonies, " a feature that distinguishes "The Beatles: Rock Band" from its predecessors.

CNN: Review: 'Beatles: Rock Band' fun for jamming in groups

Steve Everett, professor of music at Emory University, said the concept of "The Beatles: Rock Band" engages kids to learn about an important 20th-century cultural phenomenon.

CNN: Review: 'Beatles: Rock Band' fun for jamming in groups

The audio of the Beatles singing is also more prominent than the vocalists on the regular Rock Band tracks.

CNN: Review: 'Beatles: Rock Band' fun for jamming in groups

At Northwestern Mason helmed a rock band that he describes as equal parts punk, the Beatles and Cat Stevens.

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"Medium" on guitar and drums with the Beatles also seems easier than "medium" on "Rock Band, " while "hard" was sometimes just challenging enough for people who had played many times before, with "expert" mode still perhaps beyond reach.

CNN: Review: 'Beatles: Rock Band' fun for jamming in groups