Kentucky Opera drops the Louisville Orchestra for performances of its next production in favor of using students from the University of Louisville. Why? The company explains that “scheduling conflicts made it difficult, if not impossible, to use the orchestra for this particular production, which involves parallel student and professional casts. When you are rehearsing two casts you have a lot of orchestral rehearsals, and there were several services where (the Louisville Orchestra) would be unavailable because of contractual restrictions.” But an Louisville Orchestra spokesperson expressed surprise at the decision…