Forgive me: Like its scratch-off packaging, “Flash Delirium," reveals more layers once you start picking at it. Congratulations' 4 minute and 16 second flagship post-Oracular Spectacular pop single (why not four more seconds, guys?) tosses up shiny slice-and-dice psychedelia that appears random at first and second passes, but does start making compositional sense, especially after the welcome signs go up and ...