Hot on the heels of having hired one of the few female tubists in the professional orchestra world, the Philadelphia Orchestra has hired another prominent woman as its new principal french horn. Jennifer Montone, who has been principal horn of the St. Louis Symphony, will become the first female principal horn of any of the so-called “Big Five” orchestras in nearly sixty years. Orchestras have been hiring women for decades, of course, but the brass sections of many ensembles have remained overwhelmingly male.