In Japan, Schlefer has worked with Reibo Aoki, Katsuya Yokoyama, Yoshio Kurahashi, Yoshinobu Taniguchi, and Kifu Mitsuhashi.
Yokoyama achieved international attention for his New York City premiere performance in November 1967, of Tōru Takemitsu's composition November Steps, for shakuhachi, biwa, and orchestra, with the New York Philharmonic, under the direction of Seiji Ozawa (with biwa player Tsuruta Kinshi).
Katsuya Kondō | Ken Yokoyama | Hideo Yokoyama | Katsuya Yokoyama | Katsuya Terada | Katsuya Eguchi | Chisa Yokoyama |