The Beatles and Steve Jobs have had a 16 year ongoing feud over the “Apple” trademark.
The bad blood between these people can not be understated.
But they recently made nice. Jobs playing the Beatles' Lovely Rita at the iPhone intro was the big hint. After that they reached a settlement and Apple Computer changed its name Apple, Inc. I'm guessing Apple paid off the Beatles.
It goes beyond that; you can't legally buy Beatles songs from any online music service. Basically, they think their music is too exceptional to be sold on an equal footing with that of any other artist. (Why this is such a big deal online, when they're just filed under "B" like everyone else in a record store, I have no idea.)
I read an article last year where some Apple executive recounted a negotiation with the Beatles' "people" sometime in 2005 or so about finally getting them on iTunes. The offer the Beatles made: Okay, you can sell our stuff, but only in a separate, walled-off area of iTunes that sold only Beatles material, was controlled by the Beatles, and couldn't even be linked to from anywhere else in iTunes ... the only ways in would have been via beatles.com and (maybe) by manually typing something like "beatles.itunes.com" into your address bar. On top of it all, Apple would have had to charge far more for a Beatles track than the usual 99 cents, for the same 128k AAC quality.
Needless to say, Steve Jobs told them to shove it.