The Cocteau Twins are not, you would think, the easiest group in the world to cover. Cocteau Twins tracks are vibe-first, and they’re more about Liz Fraser’s incandescent voice than about any particular riffs or hooks or lyrics. But Miley Cyrus still gave it a shot this past weekend, singing the Cocteaus’ 1990 wonder “Heaven Or Las Vegas” while playing at the opening of the Resorts World venue in, obviously, Las Vegas.