Only a fraction of my music appears under 'artist'

[mattsearle]

As the title says, I have probably 200 or so artists on all the music that I have saved to playlists over time, however when I go to my music then click artist there are probably only 15 artists there and all the rest are missing? It appears to be completely random so even when I have an album by various artists only one of them is there when I look in the artists view.
Thanks in advance for any help, the artist view to me is the best way to look through my music and it's so frustrating to not be able to find all that I have saved!