First you need to get the violin. To get it you must first listen to the troubador's songs. He will then give you a flower. Go to the cemetery. Now go to the first grave. Place the flower on the grave. Put on the ring of the dead and press the A button. The ghost will say that there is a treasure in the sewer. Proceed to the sewer and use the ring of the dead near the skeleton. He will give you the treasure. Then go to the merchant and give him the treasure. There will be three violins. Pick the chipped violin. Then go to the jail keeper's house. Place the violin on the table. You will hear the jail keeper coming. Run and hide by the cooking meat until you hear the violin being played. Then walk behind the jail keeper and on the wall you will find a key. Now go down the steps and free the prisoner. Then give him the crystal ball. The jail keeper will come and you will be transported outside the cell while the jail keeper is transported inside the cell. Lock the door with the key you used to unlock it.