The version I learned back in the mists of sentimental amnesia was in G but Neil on the versions I’ve heard played it in D. He had a riff coming down from D7 repeated through the verse. When he hits the chorus he goes to G for one bar then C one bar back to D one bar then D. Chorus line is four bars so play the pattern twice. So: verse 8 bars on D, chorus 8 bars, 2 times 2. G C D D If that makes sense…