William Kinderman is Professor of Musicology at the University of Illinois - Champaign-Urbana. His books include Beethoven's "Diabelli" Variations (OUP, 1987), ed. , Beethoven's Compositional Process (Nebraska, 1991), Beethoven (OUP and California, 1995), ed. , The Second Practice of Nineteenth-Century Tonality (Nebraska, 1996), Artaria 195: Beethoven's Sketchbook for the 'Missa solemnis' and the Piano Sonata in E Major, Opus 109 (Illinois, 3 vols. , 2003), ed. (with Katherine Syer), A Companion to Wagner's "Parsifal" (Camden House, 2005), ed. , The String Quartets of Beethoven (Illinois, 2006), and Mozart's Piano Music (OUP, 2006). He is also an accomplished pianist whose recordings have been met with global acclaim; his double CD of Beethoven's Diabelli Variations has appeared with Arietta Records.