This paper, based on an analysis of ayahuasca whistling incantations collected in the Peruvian Amazonian city of Iquitos and taped during a hallucinogenic healing session on August 10, 1968, will attempt to examine the very important place that music has in evoking particular visionary-type experiences in the wake of plant hallucinogenic use. It is believed that such studies are important in clarifying the often-neglected determinancy that music has in many non-Western societies, where powerful mind-altering substances have been used to heal, to communicate with the supernatural, and to open up worlds of heaven and hell. As a final comment, we might note that in the experience of the field researcher, lack of vision in various ayahuasca sessions could generally be correlated with inadequate musical ability on the part of particular healers.