Abstract: Based on the previous study from three of the first historical sources on Thorough-Bass, plublished in Italy during the beginning of the XVIIth century, this paper presents a comparative analysis between the works by Lodovico da Viadana (1602), Agostino Agazzari (1607) and Francesco Bianciardi (1607), starting from the instructions described in the first one to point out similarities and differences between the ideas and procedures observed in the origins of this technique.

Keywords: thorough-bass, figured-bass, accompaniment, harmony, music history.

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