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For any question about the site, an incorrect entry to fix, or a request about your data, write to this address. We answer within one month.
The site and its database are hosted in the European Union, even though the hosting company is American.
Work and composer entries are built from open sources (notably IMSLP, MusicBrainz, Wikidata, OpenOpus) and public exam syllabuses. Difficulty scores are computed estimates, not pedagogical truths: they can be disputed, and the feedback buttons on each entry exist precisely to correct them.
Scores and recordings are not hosted here: the site links out to the platforms that publish them (IMSLP, YouTube, Spotify), which remain responsible for their own content. If a link seems to infringe a right, report it and it will be removed.