Task: Question Answering
Input (English): Passage: By 1970, Takemitsu's reputation as a leading member of avant-garde community was well established, and during his involvement with Expo '70 in Osaka, he was at last able to meet more of his Western colleagues, including Karlheinz Stockhausen. Also, during a contemporary music festival in April 1970, produced by the Japanese composer himself ("Iron and Steel Pavilion"), Takemitsu met among the participants Lukas Foss, Peter Sculthorpe, and Vinko Globokar. Later that year, as part of a commission from Paul Sacher and the Zurich Collegium Musicum, Takemitsu incorporated into his Eucalypts I parts for international performers: flautist Aurèle Nicolet, oboist Heinz Holliger, and harpist Ursula Holliger.Critical examination of the complex instrumental works written during this period for the new generation of "contemporary soloists" reveals the level of his high-profile engagement with the Western avant-garde, in works such as Voice for solo flute (1971), Waves for clarinet, horn, two trombones and bass drum (1976), Quatrain for clarinet, violin, cello, piano and orchestra (1977). Experiments and works that incorporated traditional Japanese musical ideas and language continued to appear in his output, and an increased interest in the traditional Japanese garden began to reflect itself in works such as In an Autumn Garden for gagaku orchestra (1973), and A Flock Descends into the Pentagonal Garden for orchestra (1977).Throughout this apogee of avant-garde work, Takemitsu's musical style seems to have undergone a series of stylistic changes. Comparison of Green (for orchestra, 1967) and A Flock Descends into the Pentagonal Garden (1977) quickly reveals the seeds of this change. The latter was composed according to a pre-compositional scheme, in which pentatonic modes were superimposed over one central pentatonic scale (the so-called "black-key pentatonic") around a central sustained central pitch (F-sharp), and an approach that is highly indicative of the sort of "pantonal" and modal pitch material seen gradually emerging in his works throughout the 1970s. The former, Green (or November Steps II) written 10 years earlier, is heavily influenced by Debussy, and is, in spite of its very dissonant language (including momentary quarter-tone clusters), largely constructed through a complex web of modal forms. These modal forms are largely audible, particularly in the momentary repose toward the end of the work. Thus in these works, it is possible to see both a continuity of approach, and the emergence of a simpler harmonic language that was to characterise the work of his later period.
His friend and colleague Jō Kondō said, "If his later works sound different from earlier pieces, it is due to his gradual refining of his basic style rather than any real alteration of it.". 
Question: What was the name of the person whose experiments and works that incorporated traditional Japanese musical ideas and language continued to appear in their output?
Output (English): Takemitsu.