Given a music tag as query, this system permits to classify the tag by means of semantic facets (e.g. genre, instruments, locale, etc.), and reversely, given a facet as query to obtain the most representative tags for that facet. The semantic facets are anchored upon the structure of Wikipedia and last.fm.
The system is described in our paper: Sordo M., Gouyon F., Sarmento L., Celma O., Serra X., “Inferring Semantic Facets of a Music Folksonomy with Wikipedia”, Journal of New Music Research, in print
The code and documentation is available here.