The documentary La Spira zooms in on the project Spira Mirabilis. Spira Mirabilis is an extraordinary new project drawing together some of Europe's finest young players. It offers a radical new approach to the classical music concert. Mostly in their 20s, practising and performing without a conductor (and without any fee!), these highly-skilled players break down the traditional barriers between performer and audience. The musical experiment developed by this group of young and talented musicians is the main theme of this documentary, which attempts to focus on the ideal embedded in this manner of “playing music together”, to follow the practice in the course of work sessions and scenes from collective life.