Multiple artists tags in MP3 files

[audio_elf]

Do MP3 files support having multiple artist tags?

I have the J.J. Cale and Eric Clapton album The Road to Escondido on MP3 format and it's tagged
ARTIST: J.J. Cale
ARTIST: Eric Clapton
ARTISTSORT: Cale, J.J.
ARTISTSORT: Clapton, Eric
ALBUMARTIST: J.J. Cale & Eric Clapton
ALBUMARTISTSORT: Cale; J.J. Cale & Eric Clapton

In the control point (Naim primarily but same in Kazoo and Kinsky) the album shows under All Artists: J.J. Cale (sorted under C) but its absent under Eric Clapton.

My question - is there something screwy with my tagging, or is this not supported with MP3 files (similar works with FLAC and other formats).