Christian is singing the mantra: "Om Tryambakam" during a saturday evening satsang at Yoga Vidya Bad Meinberg, Germany. You can find this kirtan in our kirtanbook No. 800:
Om Tryambakam Yajāmahe
Mrityor Mukshīya Māamritāt (3x)
There are many english seminars every year in the different ashrams of Yoga Vidya. You can find them all by clicking here.
You can listen other mantra recordings here.