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Re:Show HN: Guitar Dashboard – Open source music theory expl... by yig on Friday September 14, 2018 @12:37PM (#17988669)
Are you referring to "A Modern Method for Guitar" by William Leavitt volumes 1-3?
Re:Show HN: Guitar Dashboard – Open source music theory expl... by throwaway8879 on Friday September 14, 2018 @12:38PM (#17988686)
Yep, that's the one!