In Purāṇa (Purana; Mythological Scripture) and Saṅgītaśāstra (Sangitasastra; Theoretical scriptures on music), twenty one mūrchana(s) (murchana; melodious tune), made of the seven svara (swara, musical note) have been mentioned. Ahimūrchanā (Ahimurchana) is one of these tunes. God Varuṇa (Varuna) is the presiding deity of this tune. It is said that this enchanting tune is capable of overwhelming even a venomous snake (Ahi means a snake).