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Laurence Libin

Pure-tuned harmonium developed by the German physicist and music theorist Arthur Joachim von Oettingen (b Dorpat, Livonia, 28 March 1836; d Bensheim, Germany, 5 Sept 1920) and built by Schiedmayer in Stuttgart. An example from 1914 is in the Musikinstrumenten Museum, Staatliches Institut für Musikforschung, Berlin. Designed to sound pure 3rds, 4ths, and 5ths, it is based on an octave division into 53 (in some versions, 72) tones and has a complex multilayered but symmetrical keyboard similar to that of Bosanquet’s enharmonic harmonium. Oettingen studied astronomy and physics at the University of Dorpat and continued his education in Paris and Berlin. He was appointed a professor in Dorpat in ...

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A re  

The pitch A in the Hexachord system.

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Any plainchant recitation formula, e.g. tonus lectionum (lesson tone), toni psalmorum (psalm tones; see Psalm, §II ); also the reciting note itself, by which ‘tonus’ can be synonymous with the Latin ‘tenor’.

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A church Mode , e.g. primus tonus (mode 1, or the Dorian mode), tonus authenticus, plagalis (authentic, plagal mode).