Is there any FCC rule which states all talk radio must be an AM Band? [View All]

Why do we not find talk shows on any FM stations? I'm assuming there must be a law or rule. I was thinking about this when exploring the option of expanding Progressive Talk Radio.

Oh, by the way. There was a TERRIFIC segment last night on C-Span 2. "After Words"

This is what got me thinking on the subject of the post:

http://www.booktv.org/feature/index.asp?segID=7910&schedID=474

On Saturday, February 3 at 9:00 pm and Sunday, February 4 at 6:00 pm and at 9:00 pm
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After Words: Eric Klinenberg, author of "Fighting for Air: The Battle to Control America's Media" interviewed by Ben Scott
Description: Eric Klinenberg is an associate professor of sociology at New York University and the author of "Heat Wave," about the 1995 heat wave that took the lives of over 700 people in Chicago. His work has appeared in the Washington Post, The Nation, and Rolling Stone. His latest book, "Fighting for Air," looks at the control of local media by companies like Clear Channel, Sinclair Broadcasting, and the Tribune Company. Prof. Klinenberg is interviewed by Ben Scott, policy director for Free Press (www.freepress.net) and co-editor of "The Future of Media: Resistance and Reform in the 21st Century."