Vyaakarana Sutra:

Also known as the Astadhyayi.

Nata, vita, gayaka:

"Nata" is a dancer or actor, "vita" is one who is conversant with music and literarature and who also serves as the royal jester, "gayaka" is a musician.

Amarakosa:

Not to be understood as a dictionary arranged in alphabetical order.

Brhadisvara temple:

Work on the temple was completed in A.D. 1009.

Cappu:

Cappu in Carnatic music means beating with the open palm the upper part of the right-hand side of the mrdanga. It represents the final beats.

Cosmic form:

Na tu mam sakyase drastum anenai'va svacaksusa

Divyam dadami te caksuh pasya me yogam aisvaram.

-Bhagavadgita, 11.8

Sanaka and others:

the four "mind-born sons" of Brahma, apart from Sanaka, are Sananda, Sanatana and Sanatkumara.

Pancakrtya:

The dance of Nataraja is called "panca-krtya paramananda tandava". Through this dance he performs the function of creation with the sound of his drum; protects the world with his abhaya-hasta (the "fear not" mudra); carries out the function of destruction with the fire held in one of his hands; with the foot placed on Musalaka he accomplishes the function of tirodhana or tirobhava, that is concealment or Maya; and the fifth function of anugraha or conferring blessings on devotees he performs by pointing a finger at his sacred left foot.

He created an index:

The word the Paramaguru himself uses here is "samjna".

Movement of your feet :

What is called "footwork" in a dance.