Om Bhur Bhuva Swaha
Tat-Savitur-Varennyam
Bhargo Devasya Dhiimahi
Dhiyo Yo Nah Pracodayaat

To chant the Gayatri Mantra
purifies the chanter.
To listen to the Gayatri Mantra
purifies the listener.

http://www.youtube.com/watch?v=P26ZvKY–KY