Английский словарь Webster - a (2)

() 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 second string of the violin is tuned to the A in the treble staff. -A sharp (A/) is the name of a musical tone intermediate between A and B. -A flat (A/) is the name of a tone intermediate between A and G.