What kind of classical music do you like? If you're talking about classical music (art music) as a whole, then I have a ton of recommendations that encompass a wide variety of forms such as: sonatas, concerti, fantasies, trios, and much more. However, if you're looking for pieces from the classical period, I mostly enjoy pieces from the time of the first viennese school which comprises three giants - W.A. Mozart, Joseph Haydn, and early pieces by Beethoven. There are many other great composers from this era, such as Johann Stamitz, who sounds similar to a young Mozart. If you enjoy some very virtuosic playing then I'd suggest any of Mozart's later concerti (number 21 to 27). If you want something less flashy, but not quite as energized as many of Mozart's pieces, then early Beethoven sonatas are the way to go. Mozart also has a couple excellent Fantasies and a fugue you can listen to hear: Mozart - Fugue in C Minor for Two Pianos K. 426 - YouTube