Forget about the glitz and glamour; all Mariah Carey needs to do is to sing her songs

About five songs into the premiere of Mariah Carey’s residency Friday at Park MGM, the first time I had seen the Grammy Award-winning singer-songwriter-actor-producer perform live, I leaned over to my wife. “Mimi doesn’t dance a lot,” I whispered into her ear, using the nickname that family and friends had given to Carey years ago. My wife’s reply was short and direct. “She’s Mariah Carey. She doesn’t have to dance.” And she was spot-on. Despite all of the glitz and glam, the eight backup dancers, trio of backup singers, four...