I can't find anything about a "4-octave range", although it might have been claimed in something I haven't seen. I definitely don't know what it has to do with Vulcan, unless Mr Spock is somehow involved. I do remember that Martin Luther King met her once, and if I'm not mistaken, was proud of her. I can understand that. It was many years ago, but I watched the first showing of all the original Star Trek episodes, and could see how ground-breakingly courageous they were.