Stegreif - The Improvising Symphony Orchestra shows what a contemporary orchestra can look like: cross-genre musicians play without notes, without a conductor, freely in space and improvise on symphonic music. This is how classical arrangements are created in a new guise. For the Long Night, they play their way from the Humboldt Forum along the Spree to the opening at the Altes Museum.An event of Kultursommerfestival Berlin 2023.