Henry Hazlitt said that when he first picked up a phone in the 1940s and heard the voice of the already legendary Austrian economist and liberal political philosopher Ludwig Von Mises on the other end, it was the equivalent of picking up the phone and hearing "This is John Stuart Mill speaking!"
Now you can sort of emulate the fascinating experience of hearing Mises's voice, a rare treat as he died in 1973. The Mises Institute has just posted an mp3 of a broadcast from the "U.S. Steel Concert Hour" from 1962, with Mises answering the not very musical question, ""Are the interests of the American wage earners in conflict with those of their employers, or are the two in agreement?" (By the by, he doesn't rap once. That was more of a Hayek thing.)
For those who prefer reading to listening, a transcript here.