“Sing 2” (*** out of four) was a warm-hearted sequel to the 2016 smash about the continuing adventures of Buster Moon (voiced by Matthew McConaughey) and his singing cohorts (Reese Witherspoon, Scarlett Johannson, and others) who bust their way onto a large-scale musical show and must persuade a reclusive rock star (voiced by Bono) to join them for the opening of their new show. Not quite at the exuberant heights of the original, as film hits a few lulls in the middle that slow things down, but still first-rate entertainment of its kind with colorful and razor-sharp animation and some dazzling musical numbers and a magnificent finale that send you out with more-than-a-smile and give you your money’s worth. As a bonus, Bono’s character steps out onstage and sings “I Still Haven’t Found What I’m Looking For.”