It exists in Luso-Brazilian musicology a thesis that the liturgical music composed for religious celebrations in Brazilian and Portuguese churches presents a great interpenetration of theatrical and ecclesiastical styles. This fact is interpreted not only as a need for symbolic display of monarchical power, but also as a "musical backwardness" of the Luso-Brazilian composers, for not being more decorous in writing sacred music. Thus, the question of decorum has been revisited by recent research, which denies the existence of a "lack" of musical decorum in the Luso-Brazilian liturgical settings, and sees the problem as a misinterpretation of the cultural context in which this music is inserted. The aim of this study is to discuss the Lusophone musical decorum from the study of eighteenth-century treatises dedicated to the investigation of the three musical styles (theater, chamber and church), and a case study of the solo parts in the Requiem Masses of José Maurício Nunes Garcia and Marcos Portugal. In this study, we use the theory of musical schema as a way of investigating the musical discourse, the communicative capacity of composers and consequently their decorum.
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