Conductor David Zinman has been named music-director-designate of the Aspen Music Festival and School, beginning with the 1997 season. He will become music director in 1998.

Currently music director of the Baltimore Symphony and Zurich Tonhalle orchestras, Zinman will succeed Lawrence Foster, who will conclude his six-year tenure at Aspen with this year's festival, which runs through Aug. 18.For the 11th year, composer-in-residence at Aspen through July 15 is Bernard Rands, who will also serve as composer-in-residence at Tanglewood July 16-Aug. 21.

- NICHOLAS MUNI, former artistic director of Tulsa Opera, has been named the new artistic director of Cincinnati Opera. He will succeed James de Blasis, who retires July 31 after 28 years with the company.

While at Tulsa Opera, where he served from 1988 to 1993, Muni produced and directed two U.S. premieres - "Le Trouvere," the French version of Verdi's "Il Trovatore," and Rossini's "Armida." He also directed a controversial production of "La Traviata," which was subsequently purchased by New York City Opera and presented there in 1991.

- THE NEW YORK PHILHARMONIC'S two top directors, Stephen Stamas and H. Frederick Krimendahl II, recently announced they will leave their posts as chairman and president as soon as successors can be chosen.

"We both have been around so long that we feel that rather than looking for one person the board really would be advantaged by looking at both our successors," Stamas told the New York Times. Both men have been on the board since the 1970s.

A search committee including the two was named to seek candidates.