Natyashastra
किन्तूपोहनसंयुक्तं धातुवाद्यविभूषितम् । भविष्यतीदं निर्गीतं सप्तरूपविधानतः ॥ ३९॥
"However, the song, adorned with the elements and supported by instruments, will manifest in the future in the form of seven types, as per the prescribed method."
english translation
kintUpohanasaMyuktaM dhAtuvAdyavibhUSitam । bhaviSyatIdaM nirgItaM saptarUpavidhAnataH ॥ 39॥
hk transliteration by Sanscript