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While exploring drop D tuning, as fate would have on a Sunday afternoon, I broke my B string. No music shops open on Sunday, all I had was an electric guitar B string as replacement. There's a lot more stretch to that, so to get it to take some twang out, I took it up one more step to a C. Using this now strange open tuning, I wrote "En passant" (French for 'in passing') is a special chess rule that gives pawns the option to capture an pawn which has just passed it.