Artist or Artists for multiple Artists

[sadsack5000]

Hi,

I've just noticed that my featured artists are not showing up under All Artists.
I have ran all my mp3's through musicbrainz picard and they are tagged to the id3v2.4 standard. Musicbrainz has utilised a new tag ARTISTS with semicolon separator's to list the main artist and featured artist in any relevant track. See attachment under column Original Values.
In this case Florence Welch does not appear in All Artists of MS, nor does John Martin in the track a few previous.

I have seen threads showing the ARTIST (not ARTISTS) tag with all artists seperated by semi colons.

So whats the score with the ARTISTS tag? Should i retag to include featured artists in ARTIST instead?

Hope this makes sense

Thanks