SHA is in G.
I must admit that for 50 years I've been playing the bit under the solo wrong as I haven't been putting that alternating open A in. Now I can't manage to change to play it correctly - not that anyone notices, they're more likely to notice if I try and play it properly and c0ck it up. And I wouldn't be playing the sodding thing at all if it wasn't that the rest of the band seemed all enthusiastic about it - I'd rather do Wishing Well which, although nearly as hackneyed, is at least more interesting to play.