Three Princesses

http://www.kidsgen.com/fables_and_fairytales/indian_mythology_stories/the_three_princesses.htm
https://www.youtube.com/results?search_query=Bhishma+Amba+Ambika+and+Ambalika

Gayatri

The venerable Bhisma, while extolling the greatness of the Gayatri from his bed of arrows declares; “Where the Gayatri is chanted, untimely deaths involving the performance of obsequies for children by their elders will not occur”. Thus it is a prayer for universal welfare which the initiated must perform as a sacred trust enjoined upon him.

http://mantracollection.blogspot.com/2012/04/24-gayatris-photos-science-origin-audio.html