Smashing Pumpkins have added three more dates to their “Shiny And Oh So Bright” tour. That trek will feature Billy Corgan, James Iha, Jimmy Chamberlin, and Jeff Schroeder “celebrating songs from their first five albums: Gish, Siamese Dream, Mellon Collie and the Infinite Sadness, Adore, and Machina/The Machines of God.” Metric will serve as support.…