Natyashastra
उपोह्य तालं त्र्यस्रं वा वृत्त्या तैस्तैः समैस्तथा । आसीनपाद्यं युञ्जीत सर्वभवैस्तु पौरुषैः ॥ ३०३॥
The seated song should be accompanied by a rhythm in triple time or by movements of equal measure, and it should be performed with all the masculine (energetic) gestures.
english translation
upohya tAlaM tryasraM vA vRttyA taistaiH samaistathA । AsInapAdyaM yuJjIta sarvabhavaistu pauruSaiH ॥ 303॥
hk transliteration by Sanscript