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DADGAD tuning
D 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 D
A 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 th
e 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 'S
tart Me Up'.