They formed in grunge's halcyon days, but Stone Temple Pilots would become one of alt-rock's most unpredictable acts, even into the 21st century. They trudged through sludgy heavy rock ("Meatplow"), pranced along to breezy slack-key guitar ("Daisy"), kicked up the dust with playful power pop ("Bagman") and even melted hearts with a touch of twang and romance ("Wonderful").