I bookmarked Dec. 21. SING ’s storyline moves along as expected: a down-on-his-luck dreamer, a Koala named Buster Moon (Matthew McConaughey), must save his dilapidating theater from foreclosure.

What makes “Sing 2” enjoyable are the tunes. And writer-director Garth Jennings assembles a characteristically quirky mixtape. An audition montage includes, among many more, such unexpected ...