query=artistNatalie~0.7 AND La AND Rose~0.7 AND feat. AND Jeremih~0.7) AND track:"Somebody" AND src:1
doesnt match because Jermiah is part of the song title in MusicBrainz not the artist credit field for this particular song. In the sytle guidelines should be part of Artist credit but this hasnt ahhpened yet for many tracks.
Only working if feat is preceded by open bracket