Now, before you guys say this is wrong, I got this tab by watching the live performance at the Newport Folk Festival in 1965. It IS the way he plays it. Don't believe me? See yourself: http://www.youtube.com/watch?v=EnO2jwvaB5c

^DWell I ain't gonna work on Maggie's farm no more ^DNo, I ain't gonna work on Maggie's farm no more ^DWell I wake up in the mornin' ^DFold my hands and thread the rain ^DI got a head full of ideas that are drivin' me insane. ^DIt's a sh^Bmame the way she makes me scrub the floor^A ^DI ain't gonna work on Maggie's farm no more

Bob Dylan - Maggies farm