aA bA cA dA eA fA gA hA iA jA kA lA mA nA oA pA qA rA sA tA uA vA wA xA yA zA [ C/U ]   new music   plural A’s or As in Western tunes, the sixth Notice in the scale (= number of notes) that starts within the note C, or simply a set of notes determined by this Be aware In algebr