WHAT BEETHOVEN LEARNED FROM K464

ABSTRACTBeethoven imitated Mozart's String Quartet in A major K464 more openly than any other work by a fellow composer. Yet critics have never explained his fascination with the fifth ‘Haydn’ quartet. This article argues that Beethoven responded to a rare and unexplored transformation of sonata form in which the primary theme returns at its original pitch in the secondary area. This preserves the melody of the theme, but reinterprets its harmonic and schematic function. Mozart explored this device with unusual rigour in k464, recalling the primary theme at pitch in both outer movements. The two primary themes share a common chromatic line whose invariant return wittily probes late eighteenth-century tonal conventions.Beethoven emulated Mozart's harmonic design in his own Quartet in A major, Op. 18 No. 5, and even intensified its more problematic features. He imitated k464 most literally in the finale of the ‘Kreutzer’ Sonata, which provided a model for similar harmonic experimentation in the Sonata in G major Op. 31 No. 1, the ‘Waldstein’ Sonata and the first ‘Razumovsky’ quartet. k464 suggests an important source for Beethoven's use of chromatic elements to problematize tonal and thematic function, a practice most evident in the ‘Eroica’ Symphony.