Ceejay proposes a minimal way to implement this enhancement.  
However, this implementation method doesn't fit well with the 
rest of the enhancement package (Bugs 2697-2701) to improve 
browsing and searching for classical music.

The key is the replacement of a tag name by a number 
based on this data structure:

our %contributorToRoleMap = (
	'ARTIST'      => 1,
	'COMPOSER'    => 2,
	'CONDUCTOR'   => 3,
	'BAND'        => 4,
	'ALBUMARTIST' => 5,
	'PERFORMER'   => 6,       # added
);


If you want the user to be able to specify which tags to include 
in the browse and search process, you need to leave the tag name 
in the database.

I would not object to a quick fix for Bug 2696 as Ceejay suggests 
if it doesn't destroy the chances for a timely solution to the entire 2696-2701 package.

Bill (Listener)