sūtra-dhāro naṭī brūte sva-kāryaṁ pratiyuktitaḥ prastutākṣepicitroktyā yat tad āmukham īritam

sutra-dharo nati brute
sva-karyam pratiyuktitah
prastutaksepicitroktya
yat tad amukham iritam
When Srila Ramananda Raya inquired about the arrangement for introducing the assembly of players in the drama, Rupa Gosvami replied that when the players first enter the stage in response to the time, the introduction is technically called pravartaka. For an example one may consult the Antya-lila, First Chapter, verse 17. Srila Bhaktisiddhanta Sarasvati Thakura says that the introduction, which is technically called amukha, may be of five different kinds, according to the Sahitya-darpana (6.288):
 

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