A year after quitting One Direction, Zayn Malik gets serious on the moody, textured 'Mind of Mine'

One Direction famously hated being referred to as a boy band. But if the term didn't fit the mega-popular British group that recently went on hiatus, the problem — at least from the outside — had less to do with the word "boy" than with the word "band."

Here was a musical outfit, originally assembled...