Orchestration of computer-aided music composition aims to approximate musical expression using vertical instrument sound combinations, i.e. through finding appropriate sets of instruments to replicate synthesized sound samples. In this work, we focus on horizontal orchestration replication, i.e. the potential of replicating the instantaneous intensity variation of a number of instruments that comprise an existing, target music recording. A method that efficiently performs horizontal orchestration replication is provided, based on the calculation of the instrumental Intensity Variation Curves. It is shown that this approach achieves perceptually accurate automated orchestration replication when combined with automated music generation algorithms.
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