Conducting favorite Rafael Frühbeck de Burgos returns. Mozart's Serenade No. 6 is a delightful orchestration for two small ensembles featuring your PSO musicians. Powerhouse pianist, Shai Wosner makes his PSO debut with Mozart’s Concerto No. 15. Bartók's Concerto for Orchestra is one of the composer's most popular works, in which each section of instruments plays a virtuosic role.