Topic: Sing HU to Open Your Heart The public is warmly invited to ECK Light and Sound Services. Each service focuses on an aspect of Eckankar. They often feature a reading from the ECK works, singing HU (a brief spiritual exercise), talks, music, and a group discussion of spiritual principles at work in daily life. The service lasts about an hour. Join others seeking to bring more insight and divine love into their lives at this special celebration of the Light and Sound of God.