In this paper we present a set of applications for content-based retrieval and transformations of audio recordings. They illustrate diverse aspects of a common framework for music content description and structuring implemented using the MPEG-7 standard. MPEG-7 descriptions can be generated either manually or automatically, and are stored in a XML database. Retrieval services are implemented in the database. A set of musical transformations are defined directly at the level of musically meaningful MPEG-7 descriptors and are automatically mapped onto low-level audio signal transformations.
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