[quote by=Maria link=Blah.pl?b=films,m=1078978727,s=16 date=1081286523]
It wasn't that "they" didn't "let" the Beatles use their own voices. "They" would've given their eye-teeth for real Beatle voices.
It was the Beatles themselves that didn't want anything to do with the film. It was a "contractual obligation" thing. Later, when they saw what a quality job the animators had done, the Fabs agreed to do the film sequence at the end, and be more visibly associated with the film.
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I always heard that they were just too busy and travelling too much to actually do the voices. Ria's response makes the most sense and i'm sure its right, but its just another little tid bit that I should have known and didnt.