1971 witnessed the foundation of est by Werner H. Erhard, a transformational training course that became a prominent part of the early movement. Melton suggested that the 1970s witnessed the growth of a relationship between the New Age movement and the older New Thought movement, as evidenced by the widespread use of Helen Schucman's "A Course in Miracles" (1975), New Age music, and crystal healing in New Thought churches. Some figures in the New Thought movement were skeptical, challenging the compatibility of New Age and New Thought perspectives. During these decades, Findhorn had become a site of pilgrimage for many New Agers, and greatly expanded in size as people joined the community, with workshops and conferences being held there that brought together New Age thinkers from across the world.