iTunes -- Script to Alphabetically Sort Composers

Does anybody know of a script to sort names in iTunes? Let's say I want the following composers to be sorted alphabetically (by first name, apparently, and a comma as separator between the items to be sorted) . . .

From:
Thom Yorke, Jonny Greenwood, Phil Selway, Ed O’Brien, Colin Greenwood

To:
Colin Greenwood, Ed O’Brien, Jonny Greenwood, Phil Selway, Thom Yorke

I could use Text Fixer online tools to do it manually, of course, but I need to sort whole batches so it would take forever.

Is there a tagger out there that offers sorting, too?