Friedrich Schneider Complete Piano Sonatas Vol II, Sonatas with Opus Numbers. Friedrich Schneider’s extensive work for piano has not to date attracted any research attention, although he enjoyed an excellent reputation as composer and conductor and was one of the most highly regarded piano virtuosos of his time. Extant of his are no less than 42 piano sonatas composed in the surprisingly brief period from 1802 to 1814, hence still before Beethoven had written any of his late sonatas.