sentences:  He organized and co-directed the New England Composers Orchestra and the Tanglewood Young Artists Orchestra, and taught conducting at Tanglewood.He appeared as guest conductor-composer at the Aspen, Banff, Tanglewood, Chautauqua, and Saratoga Festivals, and with the Boston Pops, Winnipeg, Edmonton, Baltimore, and San Antonio Symphonies and the Sverdlovsk, Leningrad, Cleveland, and American Symphony Chamber Orchestras.Yannatos composed music for both stage and television in addition to a number of chamber music pieces, choral works, and art songs.