What is in this image? Describe it as if you were explaining it to someone from the 15th century.

This image depicts four whimsical creatures resembling mice, engaged in what appears to be a musical performance or celebration involving song. Each mouse is adorned with attire reminiscent of festive hats, one of whom notably wears a jester''s cap. They are standing upright much like men might, though they maintain their rodent features such as long, curving tails. Each mouse holds a book open before them, suggesting that they are perhaps singing from hymnals or songbooks, a familiar practice even in choirs of your time for religious or celebrative purposes. Musical notes are floating in the air around them, emphasizing the atmosphere of song and melody. This artistic portrayal blends natural creature depiction with human-like behavior, creating a jovial tapestry of character and activity.