Standard (EADGBE)

 I could while away the hours conferrin' with the flowers, consultin' with the rain

 And my head I'd be scratchin' while my thoughts were busy hatchin'

 If I only had a brain

 I'd unravel any riddle for any individ'le in trouble or in pain

(Dorothy)

 With the thoughts you'd be thinkin' you could be another Lincoln

 If you only had a brain

(Scarecrow)

 Oh, I would tell you why the ocean's near the shore

 I could think of things I never thunk before

 And then I'd sit and think some more

 I would not be just a nuffin', my head all full of stuffin', my heart all full of pain

 I would dance and be merry, life would be a ding-a-derry

 If I only had a brain