This city has heard the San Antonio Symphony perform Franz Schubert’s Symphony No. 8 and Gustav Mahler’s Symphony No. 4 before. But this city has never heard those works like the San Antonio Symphony played them Friday night at the Tobin Center for the Performing Arts. The high level of performance coupled with the responsive Tobin Center acoustics elevated these pieces to new concert heights. To hear both on the same program magnified the beauty of each, given the similar rich harmonic languages and the shared deep philosophical waters. The Mahler Fourth is a journey to heaven. Well, most Mahler symphonies are, but the Fourth travels a lighter, more scenic path than, say, the composer’s longer Second Symphony, “Resurrection.” The orchestral transparency and the balances between the different instrumental sections resonated across the H-E-B Performance Hall as one Mahler tune followed another, interrupting and extending each other.