A, the first letter of many alphabets. The most common sound that belongs to it, as in French, Italian, German, etc, is what you hear on the father, pronounced short or long term. In English the letter is represented by at least seven sounds, like the father, mat, mate, ass, ball of many, which, besides being used as an encore digraphs in the heat, oa in boat. -A, in music, is the sixth note of the diatonic scale of C, and is when you are in perfect harmony with the last note in the proportion of 3 / 5 to 1. The second string of the violin is in compliance with this note.