John Mayer,he covers a bob dylan song "Don't think twice, it's alright" at a hotel cafe
i really liked his version so i decided to tab it
here is the video link
http://www.youtube.com/watch?v=OtQD-2--66k
you can watch the video to get the chord change timing.
havent really gotten down the picking style, so i kinda make my own up

The song is played with capo on 4th fret
the cords are

E|-3-0-0-0-0-3-0-                        E|-3-0-0-0-2-0-0-0-0-0-
B|-1-1-1-0-1-1-1-                        B|-1-1-1-0-1-0-1-3-5-3-
G|-0-0-2-0-2-0-0-                        G|-0-0-2-0-2-0-0-0-0-0-
D|-2-0-2-0-3-2-0- and the second part is D|-2-0-2-0-0-0-0-0-0-0-
A|-3-2-0-0-0-3-2-                        A|-3-2-0-0-0-0-0-0-0-0-
E|-0-3-0-3-1-0-3-                        E|-0-3-0-3-2-3-3-3-3-3-

and the last part is
E|-3-0-0-2-3-0-0-0-0-3-0-
B|-1-1-1-1-1-1-1-0-1-1-1-
G|-0-3-2-2-0-0-2-0-2-0-0-
D|-2-2-3-0-2-0-2-0-3-2-0-
A|-3-3-0-0-3-2-0-0-0-3-2-
E|-0-0-1-2-0-3-0-3-1-0-3-

and you just repeat that all through the song
he mostly uses his thumb on the low E string