Messiaen taught an analysis class at the Paris Conservatoire. In 1947 he taught (and performed with Loriod) for two weeks in Budapest. In 1949 he taught at Tanglewood. Beginning in summer 1949 he taught in the new music summer school classes at Darmstadt. While he did not employ the twelve-tone technique, after three years teaching analysis of twelve-tone scores, including works by Arnold Schoenberg, he experimented with ways of making scales of other elements (including duration, articulation and dynamics) analogous to the chromatic pitch scale. The results of these innovations was the "Mode de valeurs et d'intensités" for piano (from the "Quatre études de rythme") which has been misleadingly described as the first work of "total serialism". It had a large influence on the earliest European serial composers, including Pierre Boulez and Karlheinz Stockhausen. During this period he also experimented with musique concrète, music for recorded sounds.