Under the guidance of executive producer Justin Timberlake—who sings on almost every track—Trolls is stacked with colorful, catchy melodies and playful pop-culture references. After launching to life with a Gwen Stefani-assisted “Hair Up” (which adds a maniacal dance beat to “In the Hall of the Mountain King”), the undeniable highlight is Timberlake’s infectious “CAN’T STOP THE FEELING!” Among the clever mash-ups and goofy lyrics, there are moments of genuine sweetness too, like Zooey Deschanel's heartfelt cover of Lionel Richie’s “Hello."