Srimad Bhagavad Gita is the summary of all Vedic teachings and is a part of the epic Mahabharata. It clearly teaches us the teachings of all the Upanishads in a neatly laid out situated context of the Kurushetra war between the Pandavas and the Kauravas, where the mighty warrior Arjuna hates the idea of killing his gurus and elders for earthy possessions. His chariot, Lord Krishna, advises him to go ahead and do his duty as a warrior and not worry about other things.
The following is a playlist of all the chapters chanted by Swami Brahmananda of Chinmaya Mission.
Thanks to Shri. Rupesh Bhayani for pointing to this source.