The San Antonio Philharmonic packed the Majestic Theatre on Saturday with a performance of classic rock band Led Zeppelin’s biggest hits. The orchestra — which rose in two years ago from the ashes of the San Antonio Symphony — isn’t done dipping its toes into rock and pop, though. It plans additional crossover concerts for its 2024-2025 schedule, including a performance of music from Tejano legend Selena scheduled for Jan. 3-5.