In this image provided by the Met Opera, Jonathan Tetelman portrays Ruggero in Puccini's "La Rondine." Tetelman has transformed from nightclub DJ to international opera star. (Karen Almond/Met Opera via AP)
In this image provided by the Met Opera, Jonathan Tetelman portrays Ruggero in Puccini's "La Rondine." Tetelman has transformed from nightclub DJ to international opera star. (Karen Almond/Met Opera via AP)