A complete Tchaikovsky symphony cycle, a French music festival, a Pierre Boulez salute and a European tour are among the highlights of the Chicago Symphony Orchestra’s 2014/15 season. Riccardo Muti, CSO music director, will conduct 10 weeks of subscription concerts this season, which marks his fifth year as music director. Along with his residencies in September/October, January, February/March and June, he will lead the CSO on a three-week tour of Europe in October and November, and three performances at Carnegie Hall in January.