How do singers cast spells on listeners? And why does singing carrying such special powers to cause deliriums and entrancements, even beyond preaching, acting, or rallying the masses? This presentation looks at the circuitry that operates between singers-as-spell-casters and target-listeners. It finds provocative evidence for causing deliriums in listeners in accounts of falling in love, especially as they relate to self-loss, longing, memory, and feelings of bittersweetness, or what the Greeks call feelings of “sweetbitter.” The evidence adduced comes from Stendhal as well as a cluster of writers circa 1870‒1900 who enlarged on their experiences of hearing otherworldly and divine sounds in the transporting voices of late Vatican castrati.