That’s a tough question, isn’t it? For me, depending on my mood, it would probably be Norwegian Wood, closely followed by a Day In The Life (studio version, please), Strawberry Fields Forever, and Here Comes The Sun. But I also like the happier tracks like Paperback Writer and We Can Work It Out.
There are just so many good Beatles songs, it’s hard to just pick one. As an inspiration for you, check out this amazing artistic trailer for the Bealtes Rock Band game. It’s a feast for the eyes and the ears.