This Sonata for Two Pianos is the piece that began the “Mozart Effect.” This particular piece has been proven to increase spatial reasoning, while the argument about it making you smarter is still unfounded.
This duo was written in the late 1920’s while Martinů lived in Paris. It features a beautiful cello cadenza, sometimes cut due to it’s difficulty, the work features a number of technical challenges for the performers.
Written while staying in Iowa, Dvořák’s “American” quintet came immediately similarly named string quartet. While it might not be possible to pinpoint American musical influences it is filled with uncounted beautiful melodies.