DADGAD but the 1st string is the same gauge and note as the 2nd string if the 2nd string is 013 then the 1st string would also be 013 I came up with this tuning when I was trying to tune my guitar to DADGAD and the 1st string broke and I had to replace it with the next gauge up 013 for me and tune it to the same note as the 2nd string When you play the top two strings on the same fret at the same time it sounds a little like the way a 12 string sounds when you play a pair of strings but without the octave difference
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