A year that will go down as distinctly bittersweet: beloved musical names made final bows, while others tightened their grip on global domination. Ariana Grande and Selena Gomez shook off their bubblegum image with sultry pop numbers, Eric Chou discovered new sincerity, ZAYN hit the solo spotlight in daring fashion, Drake smashed records and BLACKPINK seriously raised their vivid dance-floor game.