Madonna is pulling out all the stops in advance of her new album's release. The singer took to the stage Saturday at Miami's Ultra Music Festival, one of the biggest electronic dance music events in the United States. "How many people in this crowd have seen molly?" Madge asked the crowd before introducing Avicii, the night's headlining act. "Molly" is the slang term for MDMA, or ecstasy, a drug that's popular among rave goers. Avicii, the 22-year-old house music phenom behind the cross-genre...