Created attachment 252111 [details]
Screenshot showing that the artist eufonius is sorted after Zwei

Albums in albums view are sorted case-insensitively, but this is not the case in the Artists view. All artist names starting with an uppercase letter are sorted first, followed by artists that start with a lower case letter.

Sample query that could show the problem:
tracker-sparql -q "SELECT DISTINCT (SELECT nmm:artistName(?artist) WHERE { ?album nmm:albumArtist ?artist } LIMIT 1) AS author { ?song a nmm:MusicPiece ; nmm:musicAlbum ?album } ORDER BY ?author"

Sample output of above command:
  ...
  ZAQ
  Zwei
  Zwei爀
  eufonius
  fripSide
  fumika
  ...