IN THE LONELY HOURDisclosure's loping dance pop single "Latch," a number 11 U. K. hit in 2012, introduced Sam Smith, a London born vocalist with a deeply emotive voice. Smith grew up listening to R&B giants Chaka Khan, Luther Vandross, and Whitney Houston, but his first impression was unique, not merely for the richness of his voice, but its resoundingly expressive yet naturally delivered manner on a level most singers can't match with maximum effort. Early 2013