In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Flute
If you dream you are playing the flute, expect distress from a relative whereas if someone else plays the flute as you listen then you will be relieved of problems.