 They are 22 in number indicating twenty two "Shrutis" (tune scales).There are 72 pillars supporting this structure representative of 72 "melakarta" ragas in Indian classical system – the originating tunes for many generated tunes.Within the Nada Mantapa, to the left corner is a temple dedicated to the presiding deities of the important seven musical notes (Sapta Swara Devata).