Some relationship types, like Wikipedia, are only for specific sites. We match the URL to the relationship type, but we don't stop people from entering a completely unrelated URL using that relationship type. We should check that the URL is for the correct site.

The relationship types I can see which should be checked are:

• Allmusic (allmusic.com)
• Amazon ASIN (amazon.com/ca/co.uk/fr/de/es/it/co.jp/cn)
• Discogs (discogs.com)
• IMDb (and IMDb samples) (imdb.com)
• Myspace (myspace.com)
• PureVolume (purevolume.com)
• SecondHandSongs (secondhandsongs.com)
• Songfacts (songfacts.com)
• SoundCloud (soundcloud.com)
• VIAF (viaf.org)
• VGMdb (vgmdb.net)
• Wikipedia (wikipedia.org)
• YouTube (youtube.com)

BBC Music page should already be fixed and MusicMoz is deprecated.