2. Adele, '25'
The feverish four-year wait for the follow-up to Adele's triple-platinum blockbuster, 21, was unlike anything we've seen this decade – and she didn't disappoint on this thunderous triumph. 25 tells the story of a young woman making her uneasy peace with adulthood, like Carole King on Tapestry. The pop-savvy "Water Under the Bridge" and the soaring piano ballad "Remedy" take on relationship drama with realist fire, while the lighthearted "Sweetest Devotion" dances right into ecstasy. Adele and her A-list co-conspirators (Max Martin, Tobias Jesso Jr.) fly from drum-cannon Eighties balladry to classic gospel and blues to the kind of piano power surges that are her epic signature, holding it all together with the nuanced, towering vocal performances that have already made her iconic. "If you're not the one for me/Then how come I can bring you to your knees?" she sings. On 25, she does it over and over again.