This chapter describes and explores the artistic practice of The Norwegian Wind Ensemble, which represents a unique entry into discussing improvisation in classical music. The ensemble focuses on real-time music, music within the tonal idiom of classical music, which is collectively improvised by the musicians and facilitated by the conductor, who operates more like a curator or facilitator. The authors present empirical data from a case study research project consisting of field observations, logs, and qualitative interview data which aim to describe the rehearsal strategies of the ensemble, how the musicians experience improvising western classical music (WCM) collectively, and the role of the conductor/curator in this particular practice. Key findings are that the ensemble has developed a practice of collective artistic ownership, and that the roles of the musician and the conductor/curator are altered, compared to other classical music performance practices. The new role of the musician is viewed positively by the musicians. However, the increased artistic responsibility is also challenging to them, and requires skills not necessarily emphasised in the field of classical music.