Sting sits on a stool in a rehearsal space on Sunset Boulevard in Los Angeles. He cradles his bass and waits for drummer Vinnie Colaiuta to count in "50,000," a rocking lament to Bowie, Prince, Lemmy and others lost this year. It's from 57th & 9th, his first rock album in 13 years. His Springsteen-esque biceps pop out of a gray T-shirt...