The Philadelphia Orchestra presents the Philadelphia premiere of Symphonic Spectacular, an interactive night of popular classical music with a backdrop of large-scale images and fireworks. As Michael Krajewski conducts pieces like "Ride of the Valkyries" and "Flight of the Bumblebee," producer Elliott Forrest displays video featuring Philadelphia landmarks and scenes from around the country.
— Jonathan Lai 8 p.m. at the Mann Center, 5201 Parkside Ave. Tickets: $12.50–$49.50. Information: 215-893-1999, manncenter.org.
The Firefly Music Festival, which began Friday, brings nearly 50 bands to the 87-acre Woodlands of Dover International Speedway, in Dover, Del., midway among Philly, Baltimore, and Washington, with headlining sets from the Killers (Saturday), and the Black Keys (Sunday). The lineup leans toward indie rock, with a balance of veterans (the Flaming Lips, Modest Mouse, Death Cab for Cutie, the Wallflowers, Cake) and up-and-comers (Cults, Young the Giant, Bombay Bicycle Club, Grouplove), as well as a healthy dose of soul, hip-hop, and dance music (Girl Talk, Lupe Fiasco, Bassnectar, Charles Bradley, Mayer Hawthorne, and Philly's Chiddy Bang). Firefly is not for the music epicurean alone: It will offer a large brewery tent (sponsored by Delaware brewers Dogfish Head, who are brewing a new beer specifically for the festival), a wine tent, and eight pop-up restaurants.