all of them, but i would select 3 to be the top ones :
She's leaving home (it was actually in the game were i heard it for the first time)
Norwegian Wood (This Bird Has Flown)
Sgt Pepper lonely hearts club band/ with a little help from my friends

I am inlove with the song of Beatles especially with the hit of All You need is Love. I really like this song and I don't mind if I can play this over and over.

Helter Skelter, best drum chart in the game (with The End on a close second due to dat drum solo) and musically my favorite due to how rocking and even experimental it is.

It would be a hard call for me. I like so many of the songs the Beatles did.
For open play in the game I do like to end every session with Sgt. Pepper Reprise.
Its a fun and upbeat way to end a day of TBRB play.

I like it all! I'll pick "Paperback Writer". I mimed it for speech class final project. It was a hit with the ladies and got points with some stoner kids. What a guitar riff! I now choose this song when I just want a quick shot of sludgy amped up guitar in mid-set to work up the already frenzied crowd. They love me so much my head feels like it might explode.

"Thank you everybody, the next song.. is an oldie.. from last year.. dunno if anyone can hear me or not...... hello? can you hear me"

Helter Skelter :D

Christ. It is like choosing your favorite child, but if I'd have to, I'd say Back in the U.S.S.R., however, Birthday, Hey Bulldog, I Me Mine, Norwegian Wood (This Bird Has Flown) (DLC) and Helter Skelter are incredible as well.

I probably have a different answer after every spin, yesterday the 'Abbey Road Medley' was the highlight of an excellent 2+hours full band session that I was lucky enough to be a part of, it's always nice to have the full line-up with all of the DLC, that for me is the ultimate Beatles' RockBand experience...:-)