I would have to say Redemption Song. One single message expressed very clearly. It's so powerful. Listen to his emotions as if they were visable.
This is an impossible and pointless task for me. He didn't write a bad song that I can think of, to many to choose from.
Hmmmm too many to choose from. My personal favorite is Jammin' but pretty much any answer is acceptable
I can't choose, all of them make me feel very peaceful and show great emotion. Even if the lyrics are simple. The man knew how to get his point across.