Wouldn't it be really nice if you could give some background music to your podcast? Or, would you like an audio track as a filler between sections of your podcast? It is all possible.
When inserting music from a commercial clip, we need to be very careful of copyright and privacy issues. You can't really mix and match the music created by other people for your own purpose. A good place to find music that is safe for podcasting could be Podsafe Audio. The tracks are licensed under Creative Commons and are submitted by composers who give you the right to use them for podcasting purposes. The collection is vast. So, check it out. You might really find what you were looking for!