Purva ranga is the prelude to every performance.
The chapters 2,3 and 5 of natyashastra refer to purva ranga.
It begins onstage with curtains closed the musical instruments are arranged. The steps are as follows:
Ritual Procedure Dedication
Pratyahara The opening Nagas and rakshasas
Avatarna Singers follow Apsaras
Arambha The vocal musical exercise Gandhara
Asravana Tuning of instruments Dhanava
Vaktrapani The performing technique Dhanava
Parighattana The setting of strined instruments Rakshasas
Samoghatana Setting of rhythm Guhyakas
Margasarita Blending of string instruments with drums Yaksha
Asarita Rhythms are set
Gitividhi Honor of the gods.

This proves that it is not just a sacral procedure. It is an unique form of worship. Once the curtain is raised we have
Ritual dedication
Madraka or vardhamanaka With an accompanying dance is the song and dance praising rudra.
Uttapana Sings in the praise of jarjara the weapon of indra.
Parivartana Is in the praise of Lokapalas
Nandi To the Brahmins and kings
Suskaprakrsta Jarjara and pitru
Rangadwara Vishnu
Cari Uma
Mahacari Rudra
Trigata Conversation between the sutradara and his assistants
Prarocana Is the hint of the drama.

Moolata brahma rupaya Madhyatho Vishnu toopena
Agratha siva roopaya vrksha raajayathe namah.

The tree is analgous to the Arbour Mundi.
• Brahma on the top
• Shankara in the second.
• Vishnu in the branches
• Skanda in the 4th
• Nagas in the 5th – which is the base.
• Sanskrit drama in performance
• Drama and rituals of early Hinduism