The Piano Sonatas Opp. 109 and 110 : Psychological Influences in Beethoven's Late-Period Works
The author uses the psychological theories of Erik Erikson and Sigmund Freud to show relationships between the creative output of the later period of the composer's career, represented by The Piano Sonata No. 30, Opus 109 and The Piano Sonata No. 31, Opus 110, and the psychological crises in his life.