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A () The name of the sixth tone in the model major scale (that in C), or the first tone of the minor scale, which is named after it the scale in A minor. The secondstring of the violin is tuned to the A in the treblestaff. -- A sharp (A/) is the name of a musical tone intermediatebetween A and B. -- A flat (A/) is the name of a tone intermediatebetween A and G..