Assertion: concerto's movement | /r/HasProperty | about 15 minutes of music
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Source sentences:
text: At this juncture, the Barber and Briselli accounts differ somewhat; both are set forth here: Barber continues that he gave Briselli "the completed first two movements (about 15 minutes of music)" in "the middle of October" and "he seemed disappointed that they were not of virtuoso character--a bit too easy."