This dissertation develops a synoptic approach to the systematic identification and comparison of the distribution of material from the model in the Kyrie and in the Credo of six parody masses of Palestrina, Lassus and de Monte, published between 1570 and 1600. These masses are grouped in pairs and each pair is based on a different model. Knowing that the compositional approaches to parody vary from one composer to one another, the objectives of this research are as follows: (1) comparison of the parodic approach of two composers in masses based on the same model; (2) comparison of pairs of masses, considering that Palestrina and Lassus treat two of the three models; (3) comparison of the three masses of Lassus written on three different models. / The synoptic approach to analysis is very interesting, because after the simultaneous identification of the motives in the model and in the mass movements (Kyrie and Credo), the entire complex of selected motives and their use in the construction of the modules become very easily detectable. The results of this research show that: (1) the model does not dictate the treatment, because the same model is treated differently by two composers; for instance, two masses of Palestrina based on different models are more alike, than those of Palestrina and Lassus based on the same model; (2) the model seems to be more attractive to the composer when it is one of his own compositions; for example, Palestrina borrows more material from his madrigal Io son ferito to build his Missa Petra Sancta, than Lassus does it in his Missa super Io son ferito ahi lasso based on the same model; (3) the style of the model does not determine the style of the mass; motifs from a non-imitative model can be treated in imitation in the mass, and (4) the sections of the Kyrie are more suited to formal development (generated by the repetitions of modules), than those of the Credo.

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