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DADGAD tuningD G D G Bb D – which is a single-string alteration from open G.Flattening the third string of open D – D A D F# A D – makes DA D F A D, which is open D minor.Remember that putting a capo on an open tuning will enable you to use it for different keys. Keith Richards capoed open G at the fourth fret to play open B for 'Tumbling Dice'.And there's nothing to stop you from writing a song in open G that is actually in another key, say C, as the Stones did with 'Start Me Up'.