Abstract
This survey paper provides an overview of content-based
music information retrieval systems, both for audio and
for symbolic music notation. Matching algorithms and
indexing methods are briefly presented. The need for a
TREC-like comparison of matching algorithms such as
MIREX at ISMIR becomes clear from the high number
of quite different methods which so far only have been
used on different data collections. We placed the systems
on a map showing the tasks and users for which they are
suitable, and we find that existing content-based retrieval
systems fail to cover a gap between the very general and
the very specific retrieval tasks.
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