http://www.ascap.com/weblicense/
says
"We designed the ASCAP Experimental License Agreement for Internet Sites & Services - Release 5.0 for sites and services that perform ASCAP music in a non-interactive manner. Currently, "non-interactive" means that users cannot select individual songs or collections of song unless the performance is not more than sixty (60) seconds in duration.
We designed the ASCAP Experimental License Agreement for Interactive Sites & Services - Release 2.0 for sites and services that permit their users to select individual songs or collections of songs, such as an album.
Examples of music uses that qualify for Non-Interactive 5.0 include:
Webcasts
Performances that are embedded in a site or service, such as a "Flash" intro
"Samples" (i.e., song excerpts that are not more than 60 seconds in duration)"
http://www.siliconvalleywatcher.com/mt/archives/2...hy_your_podcas.php
says
"The podcasters who only use music that they have permission to use, as granted by the composers and performers, are not doing anything illegal. If you podcast music from places like Soundclick.com or garageband.com, where the performers and composers explicitly grant permission to copy and perform, using the Creative Commons licenses, you have nothing to worry about. It's only the people who think that because they bought a CD, that they have the right to podcast, who are in trouble. You have the right to listen to the CD with yourself and a few friends, nothing more. If you stay away from RIAA music, you will be o.k. But just to make sure, get a letter from the composers and performers just to make sure"
hopefully that helps a little bit