“Are the Melvins using Scion money as a soundlab? On “Dr. Mule,” a new and incredibly strange Melvins track cut from a compilation celebrating the car company’s 10th anniversary, the long-running sludge wizards toggle between pop élan and psychedelic erosion, between arena-rock handclaps and drone-dude feedback. That familiar Buzz-and-Dale maul isn’t entirely missing, but it runs beneath an oblong ”
