Satyadevi and Ram Vakkalanka play and sing the mantra: Song of Will - Soham during a Saturday evening satsang at Yoga Vidya in Bad Meinberg, Germany. You can find the text for this kirtan in the Yoga Vidya Kirtan booklet at number 58. So'ham is a Vedanta Kirtan song by Swami Sivananda.
There are many english seminars every year in the different ashrams of Yoga Vidya. You can find them all by clicking here: yoga-vidya.org/english/seminar/.