Ms Mimi takes the mouselings on a field trip to show them that musical instruments can be found anywhere. Gracie doesn't see the point in finding other ways to make music when they have such great instruments at school. With the help of her friends and Mrs. Thimble, she discovers that learning can be fun and inspiration can be found even in the most unlikely of places!
Ms Mimi gives the class assignment of finding a prop to help them increase their fitness levels. Angelina mistakenly thinks the project is easy and procrastinates. By the end of the day, she has nothing to show her class. When she learns to swallow her pride and ask her little sister for help, she comes up with the perfect prop!
The Mouselings' Annual Children's Day does not go to plan; Ms. Mimi performs a special modern dance, and explains to the mouselings that it took a lot of support and practice.
Angelina is inspired by musical dynamics that Ms. Mimi had taught in class to make her chores fun as a Mother's Day Gift; While decorating the store for Father's Day, Angelina and Polly learn about klezmer music.
When Alice is babysitting Polly, Angelina becomes worried Polly prefers Alice over her; The mouselings are worried that Mrs. Thimble's special Fête Française cheese, which has an overwhelming smell, will scare everyone away.
The mouselings' Halloween costumes don't arrive in time for Trick or Treat. What will Angelina and her friends do? When they decide creative ways to express their characters through dance, they realize they didn't need costumes after all!
Angelina finds a fancy tutu, and she and Polly search for the owner; When the Mousical the Musical performance is cancelled at Camembert, Viki and her friends decided to perform their own show.
