Assertion: allegretto's friend | /r/HasProperty | antonie brentano
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Source sentences:
text: The Allegretto for Piano Trio in B-flat major, WoO. 39 is a composition for piano trio by Ludwig van Beethoven that was composed in 1812 as a gift for Maximiliane Brentano, the then ten-year-old daughter of his friend Antonie Brentano.