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Most books devoted to liturgical music or religious music adopt a musicological approach, often technical. They tend to place this type of creation within the history of music. This essay is an invitation to reflect on the relation between liturgical song and theology. To what extent and in what sense can we speak of a "theology" of liturgical music? What makes music liturgical? What prevents it from being so? This essay, written in an orthodox perspective, will nevertheless interest all readers who have considered the problem of how liturgy should be sung."