nostr:npub1lql7za4pqymggtn0gexjffry3csed997fc4aysqtgqhyl350mt7sgf2xmg 

I am not a lawyer. 

While artists can purchase a license for this through traditional online sales and streaming channels, playing them in a podcast is uncharted territory. 

Technically you created a copy for distribution. 

Do you now need a license? Is it a "performance"?  Who do you pay? Which organization will claim you need to pay them?

I personally would not touch it, unless indemnified by the owner of each track.