What to make of the Chicago Symphony’s decidion to appoint Bernard haitink as principal conductor? For one thing, it means Leonard Slatkin (who really wanted the job) is being passed over. “In addition to its work with Boulez and Haitink, the orchestra will make a two-week tour of Europe under the direction of Riccardo Muti in fall 2007. Muti is believed to be the top choice for music director among the musicians, but he is prohibitively expensive and unlikely to want to take on another American music directorship after his tenure in Philadelphia in the 1980s.”