When I start building out a world for a tabletop game, if there’s a particular feeling that I’m trying to achieve as part of that build, I will usually create a playlist to help me zero in on it. I’ll do the same thing for villains, sometimes, though I tend to avoid it since I generally want my villains to be a framework with some goals and ideals that will be given greater detail and a final shape through their interactions with my player characters (however remote or limited those interactions are). I make playlists a lot more as a player, usually one for every major step along the path of my character’s journey that go from being vague ideas to solid, smaller playlists as I hit those major beats and see what shape they’ll take, but the practice that started as a player in a D&D game has grown far beyond that point. I’ve relied on it as a part of my worldbuilding and NPC development more heavily in recent years, as I’ve moved away from standard fantasy worlds and instead built worlds to reflect past failures (from when my weekly Sunday game had a Total Party Kill and we decided to start a new game in the distant future of the world they failed to save) or to reflect specific themes (like the one I built and adapted to first a Heroic Tragedy D&D campaign and then to a game of Heart: The City Beneath). For these more thematically focused worlds, the playlists have been super helpful in reminding me of the tone I’m supposed to be setting as I flesh out bits of the world my players are about to encounter or create things out of whole cloth on the spot as I run the sessions.