My rescue Pyr mix doesn't ever display discomfort but I don't exceed 75 db peaks in our large space. She will occasionally opt to climb the stairs to the first landing but I can't be sure she's actually trying to escape the music.
Great to know there are others here who favor rescues! We've had six rescue mutts, so far -- (two Pyrs, three Husky/Malamutes and one Shepard/Husky. Without exception, they've been terrific companions. Not once have we wished we'd bought a dog from a breeder.