Here's how to use alternate tunings on guitar to open the door to new sounds, generate complex chords with easy fingerings, and extend the range of the instrument.
Drop D Tuning
G Guitar Chord (Drop D tuning), G major triad
Poster
OPEN G (DGDGBD) Guitar Tuning Chords | Poster
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Guitar in Drop D Tuning: how and why
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software - Add a new guitar tuning to TuxGuitar - Music: Practice & Theory Stack Exchange
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Most Common Alternate Tunings for Guitar