Error

[Mangar]

Hello,

I tagged a song from Jimmy Page and Robert Plant this way:



and in the log I get the following error:
Warning: conflicting ALBUMARTIST values ignored for file Led Zeppelin/1994 - No Quarter/01 - Nobody's Fault But Mine.mp3
first conflicting value: Jimmy Page
second conflicting value: Robert Plant

In Bubble UPnP I find that song under "Jimmy Page & Robert Plant".

What have I done wrong and how should I do it right? My plan was to find this song both under "Plant" and "Page", but it doesn't appear sorted under the letter P.