Indiana’s largest performing arts organization, with an annual operating budget of $25 million, is about to begin its fall season. For 2011-2012, newly appointed ISO music director Krzysztof Urbanski assumes his role for six of the 20 classical concerts. The ISO is one of only 17 full-time (i.e. year round) U.S. orchestras, with a fully diversified repertoire appealing to a wide audience. From the just concluding Symphony-on-the-Prairie series to the upcoming classical, pops, family and Yuletide-series season, with some Happy Hour programs thrown in for the younger demographic, we move inside the ISO’s home at the Hilbert Circle Theatre. The ISO annually performs about 200 concerts to audiences exceeding 400,000.