The Smashing Pumpkins, “Shiny and Oh So Bright Vol. 1.” Twenty-two years ago, in the legendary “Homerpalooza” episode of The Simpsons, Bart, listening to The Smashing Pumpkins, remarks, “Making teenagers depressed is like shooting fish in a barrel.” The question before Billy Corgan and three-quarters of the original Pumpkins…

Photos: Alessio Neri OAKLAND — Nineties alt-rock superstars Smashing Pumpkins brought their Shiny Oh So Bright quasi-reunion tour to the Oracle Arena on Monday, with a marathon three-hour setlist that mined the band’s hits, deeps cuts and frontman Billy Corgan’s often idiosyncratic cover song selections. The Pumpkins’ set began with…