What are some great acoustic songs to learn on guitar?!

What are some great acoustic songs to learn on guitar?

right now im learning over the hills and far away by led zeppelin, awesome song by the way. but when i get that one down there are more i wanna learn. name some other than jack johnson and ben harper because they are already on my to learn list. (no dave matthews)

3 days ago
thanks for the answers i look into some of them, i already know a couple of them but give the others a try.

sweet ,another acoustic guitar player , try greenday (good riddance)!