Book excerpt: Technology revolutionised the ways that music was produced in the twentieth century. As that century drew to a close and a new century begins a new revolution in roles is underway. The separate categories of composer, performer, distributor and listener are being challenged, while the sounds of the world itself become available for musical use. All kinds of sounds are now brought into the remit of composition, enabling the music of others to be sampled (or plundered), including that of unwitting musicians from non-western cultures. This sound world may appear contradictory - stimulating and invigorating as well as exploitative and destructive. This book addresses some of the issues now posed by the brave new world of music produced with technology.