Instrumentalist Royal Academy by Gideon keys - 5 - string bass guitar tuning 5 string basses are becoming more common. They can be tuned adding an extra low string B, E, A,
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7-string bass – No Treble
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Basic open position chords for Viola da Gamba and Lute -- 7 string Bass Viol -- D tuning with added low A -- pg 1
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The Ultimate Guide To 7 String Guitar Tuning - Killer Guitar Rigs