Part 4 of the “My Favorite Classic Movie Men” series — Ziegfeld Girl is a splashy MGM melo-musical (if that’s not a thing, like melo-noir in my last post, I’m coining it, too!) about three young women who are thrown headfirst into the lavish world of the Ziegfeld Follies. (Actually, it’s more like a soap opera with music, in the form…