What are your favorite Beatles songs? (As many as you like) and why?

"I'll follow the sun" - It's happy/sad and very catchy.

The original lyric was to have included:

"One day you'll find that life has run"

But they decided that was a bit morbid, so it was changed to:

"One day you'll find that I have gone"

Here Comes the Sun, Penny Lane, Obladi Oblada