 For instance, the first movement of the "Waldstein" sonata, in C major, modulates to the mediant E major, while the opening movement of the "Hammerklavier" sonata, in B major, modulates to the submediant G major, and String Quartet No.13 in the same key modulating to the flattened submediant key of G major.Tchaikovsky also implemented this practice in the last movement of his Symphony No.