A Dictionary of Music and Musicians/Appassionata
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APPASSIONATA (Ital.), 'Impassioned.' Best known by its use in 'Sonata appassionata' as a title for Beethoven's Op. 57. The title was not his, but was added by Cranz the publisher, or some one else. He himself only uses the term twice—in Sonatas Op. 106 and 111.