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As far as I know, YMMV pages for creators ARE allowed, if it's about their works that don't have a page yet. This includes musicians, of course (as you can tell by the huge number of musicians who have a YMMV page).
Just don't apply No Real Life Examples, Please! stuff to them as a person.
Is it true that YMMV pages for real people aren't allowed, or does this rule only apply if their main page is prefaced with "Creator/"? Would it be permissible to creator YMM Vs for musicians as long as it is solely focused on their music?