guess the weight by listening to the pitch

 Nammazhwar's songs are sung to this day at Srirangam and other places of where Vishnu is worshipped. Nathamuni is said to have set them into music after his discovery of these verses. During that period, a dancing girl sang songs in the same celestial tune (in which Nathamuni set the prabandhams into music) at the court of the Chola king in Gangaikondacholapuram. The tune was rare and could not be appreciated by the common folk and hence the king slighted the dancer. The dancer travelled to the Veeranarayanapuram vishnu temple and sang before God in the same celestial tune. This was appreciated by Nathamuni who understood the nuances of the tune. On hearing that Nathamuni himself had appreciated the dancer's singing, the king visited the temple and enquired why Nathamuni had appreciated that unfamiliar tune. To display his prowess, Nathamuni ordered several cymbals to be sounded and determined the weight of the cymbals from the pitch of the sound that they produced. This impressed the king and he accepted the superiority of the celestial tune.

The ritual of worship as followed in Vishnu Temples is based on two early standard works. The first being Vaikhanasa Sutra which probably belongs to the Krishna Yajurveda school. The other is the Panchratra Agama which belongs to the extensive Tantra literature, believed to have been composed by Narayana himself. The Agama has a peculiar philosophy of its own, the Bhagavata Cult, which is very old and is referred to in the Mahabharata and Badarayana Sutras. Nathamuni, made a provision for the recitation of Tamil vedas on appropriate occasions during the main festivals of the lord.^[9] He is thought to be the originator of the Araiyar Sevai