Here’s two online recordings of Milton Friedman being interviewed by Russ Roberts of econlib.org (great site to copy MP3 files to listen to)
Friedman on money:
http://www.econtalk.org/archives/2006/08/milton_friedman.html
Friedman on capitalism and money:
http://www.econtalk.org/archives/2006/09/friedman_on_cap_1.html