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In page Ursula Günther:

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Ursula Günther coined the term ars subtilior which classified the music of the late fourteenth century to describe the subtle rhythm reflected in the music of the time. Another field of research was the work of Giuseppe Verdi. She published his opera Don Carlos in an issue with the five-act French original version and also with the four-act Italian version. She published widely, becoming one of the most influential musicologists of the twentieth century.[citation needed]