Technically autonomous, the Macadam Piano operate on most terrains except too soft places (like beaches of dry sand). A restriction for cobblestones: the pianist plays more rag time than Chopin because of the vibrations
The piano moves forward, backwards, turns on itself, ascends and descends the slopes and sidewalks, walks and goes to the rhythm of the musician to bring to life the streets and squares. The violinist is on foot or travels on the piano.