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ARTIGOS

Vol. 12 No. 1 (2024): Percepta - Revista de Cognição Musical

Partial Logic of an Algorithm of the Difficulty: Soprano-Alto-Tenor-Bass a Cappella Repertoire for Amateur Adult Choirs

DOI
https://doi.org/10.34018/2318-891X.12(1)180-205
Submitted
October 31, 2024
Published
2025-02-12

Abstract

This article aims to explore the nature of difficulty and represent, through pseudocode, the input data structure of an algorithm which captures how such sensation develops in the work-choir relation. Engaging with fields such as programming, value philosophy, musical analysis, vocal technique, and musical cognition, are established concepts of instant, global, and mean difficulty, with mathematical formulations for the latter two. As feasibility criteria of a work for a choir, a scale from 0 to 10 is defined for mean difficulty, with a maximum preparation period of 11 months. Following an analysis of Mendelssohn’s partsongs, compositional parameters are selected, generating 28 score observation instructions validated by principal component analysis. From the instructions, 35 corresponding choir competencies are deduced. The instructions and competencies form the input data structure for the algorithm, now available as a prototype at calculadoracoral.com.br.

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