“I’ll bet Billy Corgan would sound great singing bluegrass tunes!” Cotillions William Patrick Corgan Martha’s Music, Nov. 22 That’s not a sentence that has been uttered out loud by many—even diehard fans of the Smashing Pumpkins. And yet, here we are. Cotillions is the second solo album released under Corgan’s…

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…