A Gustav Mahler classic, a visiting string quartet, Carl Orff’s towering masterpiece and a popular opera combined to highlight the classical music year in San Antonio. In common, they all were staged at the Tobin Center for the Performing Arts, accentuated by outstanding acoustics. Symphonic music Mahler: The San Antonio Symphony has a knack for concluding seasons with soaring, transcendental music. The final concert of the symphony’s 2016-17 season in June was another example, a reprisal of the first work Music Director Sebastian Lang-Lessing conducted with the orchestra after being named music director in 2010. Only this time, Lang-Lessing leveraged the Tobin Center’s acoustics to lift the performance to sonic heights.