Quote:
Originally posted by Starkeeper:
I also have it in G for guitar (capo 3). In the guitar version the chord is G5.


Well, Starkeeper, there was your answer all along - if it was G5 in the key of G, it would be Bb(5) in the key of Bb.....

Sometimes we just tend to over-think the obvious...!
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An arranger is just a tool. What matters is what you build with it..!