Zatorre, R., Halpern, A., Perry, D., Meyer, E., & Evans, A. (1969). Hearing in the Mind’s Ear: A PET Investigation of Musical Imagery and Perception. Journal of Cognitive Neuroscience, 8(1), 29-46. https://doi.org/10.1162/jocn.1996.8.1.29 (Original work published 1969)