would it be possible to have an escape character set for the extended artist/performer/instrument fields
something like the curly brackets maybe?
anything between them is still displayed but not read into the artist field
eg. when musician info is sketchy you could have:
Luke Wills {possibly}: bass
Jack Lloyd {possibly}: bass
Luke Wills {possibly}: bass would still be displayed but only Luke Wills (rather than Luke Wills {possibly}) would be used in thumbnail browser and other "Artists" sorted areas