“Shamanism (pron.) is a practice that involves a practitioner reaching altered states of consciousness in order to encounter and interact with the spirit world. A shaman is a person regarded as having access to, and influence in, the world of benevolent and malevolent spirits, who typically enters into a trance state during a ritual, and practices divination and healing. “ WIKIPEDIA
Shaman’s were known to perform rituals, where they would notably play music for extended periods of time while using trance inducing techniques. They put people into states of trance, periods of Religious Ecstasy, and people would have vision quests.
Hmmm…. sounds vaguely familiar