(_1st Period._) Reference has already been made to his youthful efforts. After the small choruses, the songs, the string quartet, op. 2, and the symphony in D minor, there appeared some interesting experiments in various fields of composition. The list includes a pianoforte sonata, op. 5; a sonata for violoncello and pianoforte, op. 6; the serenade, op. 7, for wind-instruments, patronized by von Bülow; a violin concerto, op. 8; "Stimmungsbilder" for pianoforte, op. 9; the French-horn concerto, op. 11, already referred to; a symphony in F minor, op. 12; a pianoforte quartet, op. 13; and "Wanderers Sturmlied," for six-part mixed chorus and orchestra, op. 14. This choral work has been called "a broadly flowing stream of polyphonic vocal harmony against an elaborate and independent orchestral accompaniment that was something quite unprecedented." The above compositions comprise what might be termed the first of Strauss' creative periods, having all been written before he was twenty. They present a conventional though rapid development of and graduation from the dominating influences of Mendelssohn, Schumann, Brahms, as suggested above, and gradually point more and more toward Berlioz, Liszt, and Wagner. (_2d Period._) The symphony in F minor, written in 1883, may be looked upon not only as the culmination of these earliest attempts, but also as the first of Strauss' really significant orchestral compositions. Its maiden performance took place not in Germany but in this country, when, in 1884, Theodore Thomas produced it in New York with the Philharmonic Society. Several years now elapsed before Strauss was ready to offer to the world the first of his great symphonic tone-poems: "Aus Italien"--sinfonische Phantasie, G-dur (op. 16, 1886). This was a marked advance upon the previous symphony, but though it reveals the subsequent path Strauss was to pursue, and embodies complex polyphony and increased command over the technics of orchestration, it is still dominated by Mendelssohn's and Schumann's subjective idea of program-music. (_3d Period._) Not until von Bülow and Ritter had fathomed the true depth of their young associate's latent powers did he proceed to evolve his conceptions in a language that has startled the entire musical world.