Open G tuning is a tuning for guitar, such that the open strings play a G major chord with no fingering or capo.
An open tuning allows a chord to be played by strumming the strings when "open", or while fretting no strings. The base chord consists of at least 3 notes and may include all the strings or a subset. The tuning is named for the base chord when played open, typically a major chord, and all similar chords in the chromatic scale can then be played by barring exactly one fret. Open tunings are common in blues and folk music, and they are used in the playing of slide and bottleneck guitars.
The standard Open G tuning is D-G-D-G-B-D, low to high. It contains the notes of the G-major chord.
Read more about Open G Tuning: Repetitive Variants For Special Instruments, Use in Rock Music
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