Natyashastra
प्रयुज्य गीतकविधिं वर्धमानमथापि च । गीतकान्ते ततश्चापि कार्या ह्युत्थापनी ध्रुवा ॥ ५८॥
"By using the method of musical chanting, and even as the performance progresses, the conclusion of the song should then be followed by the steady action of the elevation (of the performance)."
english translation
prayujya gItakavidhiM vardhamAnamathApi ca । gItakAnte tatazcApi kAryA hyutthApanI dhruvA ॥ 58॥
hk transliteration by Sanscript