The Mudita Group is singing the mantra Kali Kali Maha Kali Durge Ma.
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/.
Kali's earliest appearance is that of a destroyer of evil forces. Over time, she has been worshipped by devotional movements and Tantric sects variously as the Divine Mother, Mother of the Universe, Adi Shakti.
Kali is often portrayed standing or dancing on her consort, the Hindu god Shiva, who lies calm and prostrate beneath her. Kali is worshipped by Hindus throughout India.