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Improvement
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Resolution: Unresolved
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Normal
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None
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None
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None
MusicBrainz 'Special Purpose Artists' (SPA) are not related to any specific artists, style or taste. This means they are not suitable for recommendations, based on a user having listened to them in the past. For instance: [anonymous], [no artist], [unknown], etc.
A list of SPA to be excluded can be found here: https://musicbrainz.org/doc/Style/Unknown_and_untitled/Special_purpose_artist
The exceptions may be the [Disney] and [church bells] SPA, which relate to specific interests and don't have too many releases attached.