An opera house that once had a glorious era is gradually declining and facing the fate of being mortgaged and confiscated by the bank. The current owner, Koala Buster (voiced by Matthew McConaughey), does not want to see his father's lifelong efforts end, so he decides to plan a singing talent show, but he didn't notice that the prize money was printed as $100,000, which he can't afford at all. Inspired by the prize money and the dream of singing, pig mother Rosita (Reese Witherspoon), teenage porcupine Ash (Scarlett Johansson), mouse singer Mike (Seth MacFarlane), shy baby elephant Mina (Tori Kelly), gorilla Johnny (Taron Egerton) and other music lovers have come to apply. They have their own insurmountable obstacles, and for their own dreams, they have to do their best to chase even a little bit of hope...