Interplay between musical practices and tuning in the marimba de chonta music
This research addresses the interplay between tuning and musical practices in a specific cultural tradition, offering insights into how external influences and inherent properties shape music, but it is incremental as it applies known concepts to a new dataset.
The study analyzed the marimba de chonta music in Colombia, finding that its tunings align with isotonic scales and have shifted towards just octaves due to Western influence, while musical practices exploit broad dissonance minima and avoid narrow peaks due to tuning uncertainties.
In the Pacific Coast of Colombia there is a type of marimba called marimba de chonta, which provides the melodic and harmonic contour for traditional music with characteristic chants and dances. The tunings of this marimba are based on the voice of female singers and allows musical practices, as a transposition that preserves relative distances between bars. Here we show that traditional tunings are consistent with isotonic scales, and that they have changed in the last three decades due to the influence of Western music. Specifically, low octaves have changed into just octaves. Additionally, consonance properties of this instrument include the occurrence of a broad minimum of dissonance that is used in the musical practices, while the narrow local peaks of dissonance are avoided. We found that the main reason for this is the occurrence of uncertainties in the tunings with respect to the mathematical successions of isotonic scales. We conclude that in this music the emergence of tunings and musical practices cannot be considered as separate issues. Consonance, timbre, and musical practices are entangled.