Wikipedia: "The Town Musicians of Bremen (German Die Bremer Stadtmusikanten) is a folktale recorded by the Brothers Grimm. Despite the title of the fairy tale, the characters never actually arrive in Bremen.
In the story a donkey, a dog, a cat, and a rooster, all past their prime years in life and usefulness on their respective farms, were soon to be discarded or mistreated by their masters. One by one they leave their homes and set out together. They decide to go to Bremen, known for its freedom, to live without owners and become musicians there."