a common chord

Speaking on 10th July, 1849, the Irish harper Patrick Byrne explained to the antiquarian John Bell, the system for tuning the early Irish harp. After starting at na comhluighe, and using a cycle of 5ths to set the middle octave of the harp, he says

Then you sound the G on the violin & B & D, and the octave above which is G which makes a common chord

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