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The notion of musical similarity is particularly complex because there are numerous dimensions of similarity. If similarity takes place between different fragments from one musical piece, a musical similarity implies a repetition of the first occurring fragment. As well, eventually, the similarity does not occur by direct repetition, but by presenting in two (or more) set of relations, some common values or patterns. Objective musical similarity can be based on musical features such as:
- Pitch interval similarity
- Melodic similarity
- Modulation pattern similarity
- Timbral similarity
Similarity is relevant also in music information retrieval. Finally, musical similarity can be extended to the comparison between musical gestures in performance and composition.
Automatic methods of musical similarity detection based on data mining and co-occurrence analysis has been developed in order to classify music titles for electronic music distribution.
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