No Rock And Roll Fun

SING YOUR SPEECH: Interesting event at the University of Central Oklahoma, where the issue of the First Ammendment right to free speech was approached by getting the audience to sing previously censored songs. We're not sure the extent to which standing in a crowd bellowing 'we all live in a yellow submarine" will help protect American's rights to express themselves, but if it does, it can only be a good thing.
But why was Yellow Submarine banned in the first place?