The Chicago Symphony Orchestra is hoping to fit itself into the busy lives of modern professionals with a new series of concerts aimed at multitasking, sleep-deprived workaholics. The concerts will begin quite early in the evening, and will run no more than 90 minutes, with no intermission. Gone will be the traditional orchestral formalwear, and a host will guide the audience through the program. Another new series will focus on film music, with the CSO providing live accompaniment to a Charlie Chaplin film projected above the stage. It’s all about attracting that elusive new audience that has become the Holy Grail for every American orchestra.