The aim of this paper is to discuss possible ways of describing some music constructs in a dual context. First, that of a specific software application, a tool for content-based management, content edition and content-based audio transformation: the Sound Palette. Second, that of the current standard for multimedia content description: MPEG-7. Different musical layers, melodic, rhythmic and instrumental, are examined in terms of usable descriptors and description schemes. After discussing some MPEG-7 limitations regarding those specific layers given the needs of our application, some proposals for overcoming them are presented.
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