Possibly, some people might suspect him of a degree of under-bred pride; I have a sympathetic chord within that tells me it is nothing of the sort: I know, by instinct, his reserve springs from an aversion to showy displays of feeling — to manifestations of mutual kindliness.
There are no more uses of "chord" in the book.
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In her first day learning the guitar, she has learned how to play G major, C major, and D major chords.
My father and I would stay up at night and sing some of the songs together as he attempted to work out the chords on his guitar.