Modern interviews of classic movie stars are on ICONS Radio Hour.
Just finished the Arlene Dahl interview. The MGM star reveals that she was first choice to play the shrieking silent film star who has trouble when movies with sound are made, a role that went to Jean Hagen. I'm speaking, of course, of Lina Lamont in the classic Singin' in the Rain (1952). Dahl turned down the role because she didn't believe she could do the screaming "Brooklynese," as she calls it.
Below is the link to the website for the Dahl interview. There are others, including a chat with Farley Granger, Jamie Niven (a son of David Niven), Jean Simmons and even one of Robert Osbourne.
ICONS Radio Hour is hosted by writer/director John Mulholand and Stephen Bogart.
Update: March 12, 2013
As of this date, ICONS has pulled down the interviews on its website.