Sonus dulcis for String Orchestra, no. 375j (2000, Rev. 2003)
Composed by Andrián Pertout
Performance at the 'Primavera Vien Danzando' as part of the Southern Cross Philharmonia 2009 Concert Series
Recorded live at Melba Hall, University of Melbourne, Parkville, Melbourne, Australia, 24 September, 2009
The Southern Cross Philharmonia Orchestra conducted by Gerald Gentry
Sonus Dulcis or 'Euphony' -- the Latin expression characterizing a sound, noise, voice, or tone that is sweet, pleasant, delightful, charming, or dear -- was conceived in August of 2000 originally as a work for string trio, serving as an exploration of the system of just intonation, or pure intervals (whereby "frequencies of the individual tones reflect the precise mathematical proportions that occur in the harmonic series"), and therefore attempting to avoid sequential intervals with non-superparticular vibration ratios. German physicist Herman Ludwig Helmholtz was its passionate advocate, and his research suggests that in actual performance string players have a natural tendency towards just intervals, and especially in the absence of fixed pitch keyboard instruments. The work's pitch material features the Japanese 'In' scale, which is generally associated with art, koto and shamisen music, and is essentially a hemitonic pentatonic scale incorporating two auxiliary tones, E flat and B flat. It features the major half-tone (16/15), minor tone (10/9) and major tone (9/8) intervals. In 2003, the work was especially arranged and revised for the Oare String Orchestra, to be then recognized as the Joint-Winner of the Judges' Prize and Winner of the Audience Prize of the 2003 Oare String Orchestra Third International 'Music for Strings' Composing Competition (Faversham, UK).
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