I’m surprised no one’s brought up his secretary. This would be the perfect time for her to shine. Also what’s wrong with the baby listening to traditional demon music? That is his culture. The demon lord likes it and he turned out pretty cheerful and upbeat (not as much as reita, but he isn’t an emo edgelord either).
Pretty sure the first set of songs the Demon King listed are made up names for songs from the DOOM soundtracks. For example "Be Furious, Then Rip Your Foes Apart" is "Rip & Tear".
Edit: Just saw that everyone else had the same idea. lol
@TNT261 That's because the secretary is a simp for idols, not an idol herself. Sure, she can criticize wheter a song is good or not, but that doesn't mean she can actually sing it.
Also, there's a difference between listening to cultural music and listening to music that won't turn the baby into a suffering wreck once it's born.