Passau, a cultural city in Germany, is not only the border between Germany and Austria, but also the intersection of the Danube, the Inn and the Irz River. The water level of the river is only slightly lower than that of the houses along the coast. It is also known as the Venice of Bavaria. ". The narrow Pasau seems to be a giant ship floating down, three rivers of different colors converge here, it seems that the sounds of different instruments finally merge into a symphony, the castle and the building in the distance hope. The rainbow road in street has represented shops along the street in the past. The traces of time that have settled down are always fascinating. From the street to the end of the street, leisurely walks, the corners of the city are filled with stories, and the elegant songs pass through the footsteps of the tourists. In the Danube region where music is conceived, no matter how ordinary the corner is, it is playing the music of the color. A piano is a period of time, slowly waiting for the visitors.