Between 1976 and 1986 the Dutch group Hoketus were central to the creation of the sound and aesthetic of the Hague school. Through their rehearsal process they challenged and redefined the role of the composers who wrote for them in relation to the ensemble, and in doing so they challenged conventional notions of composer privilege and power. While not going as far as free improvisation groups in erasing the boundaries between composers and performers, they created a situation in which traditional hierarchies were overturned. Without ever claiming co-ownership of the resulting works, the group actively participated in the creative process and so could claim a higher degree of ownership and responsibility for the music they played than is usually the case.