If you're using copyrighted or popular music for your podcast production (like the opening theme), I would say two things to you:
1. Stop taking the risk.
2. You don't have to take the risk.
You may not realize just how many alternatives that are available. Here are a few examples:
Pond5 - You can search and purchase royalty-free music music and filter specific criteria like price, commercial use, P.R.O. music, etc.
AudioJungle - Search music and pay for the appropriate license.
MusicLoops - You can search royalty-free music here with prices lower than a lot of what you find on Pond5.
YouTube - This is not a misprint. Yes, you can find some free music and sound effects at YouTube!