Between 1908 and 1911, New York Symphony Orchestra conductor Walter Damrosch engaged the modern dancer Isadora Duncan to perform with his orchestra in New York and on three tours of the Midwest. Posing considerable risk to his reputation as an elite conductor, this unusual alliance grew in part from his concert manager's wish to compete with the Salomé dance craze raging in vaudeville halls across the country. Damrosch's “pioneering spirit” allowed him a genuine appreciation of Duncan's expressive, transcendent dancing. Yet for his critics, the shockingly under-dressed dancer, just back from her conquest of Europe, represented yet another sensational Salomé eager to capitalize on the popular profanities of market-driven entertainment. Music critics and Protestant clergymen from St. Louis to Boston berated Damrosch for what they saw as an immoral capitulation to mass consumerism and a desecrating abuse of the sacred repertoire he guarded—a repertoire defined in part by its distance from dancing. This article draws on critiques in the daily press, Damrosch's personal papers, and scholarship in dance and religious studies to situate Damrosch's marketing experiment with Duncan in the wider context of Progressive-era devotional life, where similar concessions to mass entertainment arose in the urban revival movement of the Third Great Awakening. Damrosch's recourse to Duncan's “barefoot dancing”—oddly akin to the tactics of big tent revivalists espousing Muscular Christianity and epitomized by Billy Sunday's pulpit pantomimes—illuminates the collision of spiritual and economic concerns that shaped both musical and ecclesiastical arenas of the American “sacred.”