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Thanks! It's drop-D tuning. I was going to submit this one but I forgot to mention it in the video, I think that's a requirement. It's all good though. Many more to come :D

Ah, I thought I recognised that Drop D - the opening sequence reminded me of a John Denver number - he was quite fond of Drop D - Colorado Rocky Mountain High! Really enjoyed it. Thanks! :-)

You inspired me to do one in Drop D for the latest competition. :-)