differences can however be discerned among these works. The brings the theory up to date, rationalizes intervals and scales, introduces the concepts of (self-generating note, upper partial), and of . is established as the . It also fixes and standardizes musical intervals on the keyboard, defines the accordatura, range, preferred strings (for particular notes) etc., for a variety of stringed keyboards. It also innovates and dedicates a new keyboard to Achyutaraya. A new scheme for classifying ragas into (superior), (middling) and (inferior) on the basis of their expressive potential is also expounded in the work. It also resolves the problem of the and notes. See also Vijayanagara empire Carnatic music Haridasas and Carnatic music Annamacharya Notes References Svaramelakalanidhi of Ramamatya - by N. Ramanathan External links Carnatic music Musicology Cultural history of Karnataka Indian music history