This playlist was created by https://www.tunemymusic.com that lets you transfer your playlist to TikTok from any music platform such as Spotify, YouTube, Apple Music etc.
I stumbled upon Happy Day In Hell by Erika Henningsen, Stephanie Beatriz, Mick Lauer, Sam Haft, Keith David, Blake Roman, Andrew Underberg and it's been on repeat ever since. It's got me totally hooked on the Hazbin Hotel Original Soundtrack.