In the Vishnu Purana sage Parasara tells Maitreya that the Universe is the embodiment of sound (nadaathmajam jagat), and it is from nada
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that the Vedas, Agamas, Itihasas and Puranas came.
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Vishnu is nada roopa, says Parasara. Pancharatra Agamas govern worship in many Vishnu temples like Srirangam, Kancheepuram Varadaraja, Kumbakonam Sarangapani and Melkote temple, to name a few. The Pancharatra Agamas are said to have been given by Lord Vishnu Himself, and hence they are known as Bhagavad Sastra.
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Aniruddha Samhita gives ragas for the different directions —
Gandhara (East), Kaisika (South), Kamada (West) and Takka (North).
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