Jeffrey Kahane debuts this week as the Colorado Symphony’s new music director, succeeding Marin Alsop, and he has big plans for the ensemble. “He envisions the orchestra in four or more years playing in New York’s Carnegie Hall and perhaps even touring to Europe or South America.” Kahane is also promoting a “chamber music style” of music-making in which he and the musicians work as colleagues, rather than a conductor simply barking orders from on high. In that vein, he will conduct several concerts this season while seated at a piano keyboard, playing a concerto while leading the orchestra.