While the Smashing Pumpkins’ lineup has constantly changed, the alternative rock band’s sound has not. Still under the direction of founder, frontman, and alien space guy impersonator Billy Corgan, the band is currently on its “In Plainsong” tour. Taking a different angle on their set list, the Chicago-native band is stripping down to acoustic guitars and playing their greatest hits with “some light electronics.” In 1990s vernacular, it’s an unplugged set. Opening for the Pumpkins is fellow 1990s alt-rocker Liz Phair. This will be the first tour in six years for the self-proclaimed supergoddess. Phair is best known for her debut album Exile in Guyville, which mixed alternately sardonic and heartfelt lyrics with infectious and stripped-down melodies.