Yomiuri Nippon Symphony Orchestra
Otaka has served as conductor of the Tokyo Philharmonic Orchestra and became conductor laureate since 1991. From 1981 to 1986, he was chief conductor of the Sapporo Symphony Orchestra, and since May 1998 held the titles of music adviser and principal conductor. From 1992 to 1998, he was principal conductor of the Yomiuri Nippon Symphony Orchestra. He founded the Kioi Sinfonietta Tokyo in 1995, and has served as its music adviser, principal conductor, and honorary conductor laureate.