新日本フィルハーモニー交響楽団
While still in school, Sado obtained a position in the Kansai Nikikai, a Japanese school of opera, where he had the opportunity to work with the New Japan Philharmonic and the Kyoto Symphony Orchestra, learning operatic repertoire. In 1987, he traveled to the United States to attend the Tanglewood Music Festival, where he studied with Seiji Ozawa. Later he won the Davidoff Special Prize for a competition in Schleswig-Holstein, Germany. He returned to Japan as an assistant to Ozawa and made his debut with the New Japan Philharmonic in Tokyo with a Haydn symphony series. He later studied with Charles Dutoit, Gennady Rozhdestvensky, and Leonard Bernstein, with whom he toured the Soviet Union and Germany.