Currently, no licensing exists for podcasts as they are an on demand form of audio and are downloadable by default. They also cannot easily be geo-restricted. We'd recommend staying completely clear of copyrighted music and using one of the following options insted!
There are plenty of music libraries online that are filled with some pretty awesome tracks that you can license and use for your podcast. Or, you can get libraries where you pay a monthly subscription and you get unlimited access to the entire database of music! Here are just a few places to check out:
If you can't justify paying for your podcast music just yet (which we get!), there's plenty of free music available online too! Most of this is posted under Creative Commons Licensing, which will clearly state what you can and can't do with each track, e.g. NonCommercial, Attribution, ShareAlike, etc.
Here are a few places you can check out for free music: