"Al Atlal" (The Ruins) at the Olympia Théâtre in Paris, November 1967.
Egyptian singer Oum Kalthoum had the ability to produce approximately 14,000 vibrations per second with her vocal cords and with her unparalleled vocal strength no commercial microphone utilized for singing at that time could withstand it, thus forcing her to stand at least one to three metres away. monme89
