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T. Schafer et al., “The Psychological Functions of Music Listening,” Frontiers in Psychology 4 (2013): 511. J. Lieff, “Music Stimulates Emotions Through Specific Brain Circuits,” Searching for the Mind (blog), March 2, 2014, http://jonlieffmd.com/blog/music-stimulates-emotions-through-specific-brain-circuits, as cited in B. Goldstein, The Secret Language of the Heart (San Antonio, TX: Hierophant Publishing, 2016), 29.