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This study investigates performance and perception of microintervals in first movement (Hora lunga) from Gyorgy Ligetis' Sonata for Solo Viola. The 2.5 bar excerpt was performed live by the professional viola player – the author of this paper, with intention to test the performance and perception of two intonational versions – one containing equally tempered semitones B3-C4 (100 cents), and the other containing microintervals, which should be performed by lowering pitch B3 by 49 cents, or about a quartertone (...