Bhagavad-Gita: derived from Bhagavan (Lord) + Gita (song) – “Song of the Lord”. A very important Hindu philosophical work of 700 verses found within the Mahabharata epic. The Bhagavad-Gita is in the form of a dialog between Lord Krishna and Arjuna, and is considered a central text in all branches of Vedanta philosophy.

Discussion: The Bhagavad-Gita (sometimes referred to simply as Gita) is one of the most famous Hindu texts. It is widely read and quoted. As with the Mahabharata itself, the Bhagavad-Gita is also attributed to Sage Vyasa. The Bhagavad-Gita brings together the philosophical teachings of various schools including the Vedanta (Upanishadic doctrine), theistic Sankhya and Yoga. Since the bulk of the Bhagavad-Gita is derived from Vedanta, its teachings are sometimes considered the very essence of Vedanta philosophy. There are dozens of commentaries on the Bhagavad-Gita written by various acharyas (teachers). All modern schools of Vedanta philosophy base their teachings on a system of triad scriptures (Prasthana Traya), which includes the Bhagavad-Gita, along with the Upanishads and the Brahma Sutras. The Bhagavad-Gita is also an especially respected book among Vaishnavas as a devotional work where the divine form of Lord Krishna is revealed to Arjuna. In Vaishnavism, the Bhagavad-Gita is sometimes given the same status as the Vedas (apaurusheya – not man-made) as it is considered to have been spoken by the Lord Himself.

References:
http://www.sacred-texts.com/hin/gita/index.htm
http://en.wikipedia.org/wiki/Bhagavad_Gita
http://www.geocities.com/Athens/Olym...8/gitaphil.htm
http://www.dvaita.org/shaastra/gita/...ra/gs-007.html
http://www.bhagavad-gita.org/
http://www.girirajji.com/bhagwad-gita.html
http://www.bhagavad-gita.us/