I don’t have perfect (absolute) pitch. Very few people do, even amongst professional singers and musicians. It’s a gift that can’t really be developed—as in, singing a perfectly in tune, named note (“start singing on ‘G’” for example). Most of us can only hone our ear to stay in tune with the other singers/musicians performing with us.
If we all are 20 cents flat, as long as we’re all “out of tune” together, it will still sound alright. Except to those with Absolute Pitch. :scremcat: