"I am sitting in a room different from the one you are in now. I am recording the sound of my speaking voice and am going to play it back into the room again and again until the resonant frequencies of the room reinforce themselves so that any semblance of my speech, with perhaps the exception of rhythm, is destroyed. What you will hear then, are the natural resonant frequencies of the room articulated by speech. I regard this activity not so much as a demonstration if physical fact, but, more as a way to smooth out any irregularities my speech might have."
An amazing sonic experiment that should be heard by anyone who enjoys and appreciates music.