Ramayana
तन्त्रीलयसमायुक्तं त्रिस्थानकरणान्वितम् । संस्कृतं लक्षणोपेतं समतालसमन्वितम् । शुश्राव रामचरितं तस्मिन्काले पुरा कृतम् ॥ 7-71-15 ॥
At that time he heard the story of Rama, composed long ago, set to the rhythm of strings, endowed with the three vocal registers, refined in language, furnished with proper characteristics, and accompanied by even measure.
english translation