When I'm thumbnailing, I tend to put some wordless videogame soundtrack on repeat - lately, I've been favouring the Child of Light OST - but when I do the actual drawing, I listen to a metric ton of podcast and podcast-y streams.
Lately, I've been plowing my way through the archives Critical Role, and am very nearly caught up. It's a bunch of professional voice actors who play Dungeons and Dragons in front of cameras, and it is so, so, SO good. Like, pause-the-episode-to-applaud-and/or-cry kind of good.
... It's also a solid 210 hours of entertainment, if you want something that going to keep you going for a while.
In a similar tabletop-y way, I am also a huge fan of Friends at the Table and The Adventure Zone. FatT is currently in the middle of an introduction/jumping-on-point season, so I highly recommend listening through the Marielda-episodes before you go back and listen to the previous seasons. They play a wide variety of rpg-systems, but tend to tell one story with one set of characters per season. The Adventure Zone is straight up D&D, but with a whole bag of comedy on top - it's being played by the My Brother, My Brother and Me-brothers, and their dad.
I've got a whole host of other podcasts, all of which I'm sorely behind on because I've been obsessing over Critical Role, but those three should keep you going for a while.
I like podcasts, because they're usually longer episodes, and thus keep me focused for longer chunks of time. When I listen to a playlist of songs, there's always those gaps of silence between songs - and my brain tends to wander in those gaps. Leads to less focus while drawing.