 This movement is in the classical form of a sonata, but the exposition is built on twelve episodes that are symmetrically represented in the recapitulation.The elegiac theme is presented in the first part "Lento lugubre" by the piano.In the following parts, the elegy is presented by the cello and violin, while the spirit is constantly evolving ("più vivo - con anima - appassionato - tempo rubato - risoluto)".