Harry chants Gayatri mantra during a satsang at Yoga Vidya Ashram Bad Meinberg; Germany. To sing along you'll find the text of this bhajan in the Yoga Vidya Kirtan Songbook as No. 610:
Om Bhur Bhuvah Swah
Indeed Savitur Varenyam
Bhargo Devasya Dhimahi
Dhiyo Yo Nah Prachodayat
Here is a translation - just into German only - and interpretation of this gayatri mantra. Om Shanti ...