All audio lectures are in mp3 format. They will download to your computer and be playable by most computer audio players.
Hilldale Lecture: Mark Kac, Professor of Mathematics, Rockefeller University. “When is Random Random?” (1978-1979)
A Walk Through Ramanujan’s Garden: A BBC Scotland program from about 1988. It was produced by Keith Halden,and presented by Robert Kanigel.