Hierarchical streaming is discussed. Auditory scenes can exhibit different levels of organization. At the lowest level, individual partials may amalgamate to form auditory images corresponding to distinct sound sources. At a higher level, these auditory images can combine together to form intermediate musical layers, dubbed textural streams. At the highest level, all of the sound sources may combine to form a unitary percept of the whole experience, dubbed a musical stream. The distinction between auditory streams and textural streams means that there is more to part-writing than simply writing parts; there is also the counterpoint of textural streams. This chapter also introduces scene analysis trees as a graphical analytic tool for better understanding different kinds of musical textures.
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