This Piano Trio was supposed to be for amateur musicians but was seen as far too-demanding since Mozart broke the mold and gave equal weight to all the players, not just as a showpiece for the piano.
After serving in WWI, Schulhoff returned to composing joining the avant garde of his day. This duo, composed in 1925, uses dynamics as well a playing techniques to create an incredible range of sound for just two musicians.
Rather than innovating with new forms, Felix Mendelssohn relied on perfecting those from an earlier age. This string quartet exemplifies this by developing a small melody on a massive scale, ala Beethoven.