Gayatri

http://www.prophet666.com/2010/07/brahma-vishnu-mahesh-gayatri-mantra.html

Om Dattatreyaya Vidmahe - Atri putraya dhimahi - tann Datta prachodayat

Supreme Meditation on Lord Dattatreya - The son of sage Atri - Let that Datta inspire us. 

http://www.youtube.com/results?search_query=Datta+Gayatri