"You are my Sunshine" chords: Digital sheet music says that in 1931 the orginal key was F. However cowboylyrics.com/tabs/blake-norman/you-are-my-sunshine-8002.html says Norman Blake in "O Brother Where Art Thou" sings its in F# .

And lastly guitartabs.com says just play it in G like this: intro G D7 G verse G G7 C G C G G D7 G cho G G7 C G C G G D7 G.