Peeling paint off the wall

Tiffany didn't know the strength of her voice.  One time all the sisters were singing "Hercules" and we were doing it in style, full voice and all.  We were singing it for some reunion, I think. At the end of the song, there's a wail that we gave to Tiffany because she could do it, and do it well.  A little later, a man came up to mom and said, "Man, you've got a voice in there that can peel the paint off the wall!"  He meant it about the voice at the end of the song that did that wail-thing, and he meant it in a good, strong way.