Ernest and Celestina are best friends. Even though one of them is a bear and the other a mouse, they always go on adventures together. This time they set off for Ernest's hometown, which is home to some of the world's most talented musicians. But on arrival they discover that music has been banned there for many years. Together with their new friends and a mysterious masked criminal, Ernest and Celestina must do all they can to bring joy back to the land of the bears.