The Sadness -

There are existing musical "pieces" titled or themed around this:

Depending on your intent, "The Sadness" can refer to a visceral horror film, a specific musical track, or the universal human emotion. Horror Film Concept

: A track by Bring Me The Horizon often featured in tutorials and remixes.

: A story or essay about the "Alvin" virus stripping away empathy while leaving memory intact.

: A visual or written piece focusing on the stark contrast between the bright, modern city of Taipei and the sudden, dark depravity of the outbreak. Musical Inspiration

: A remix piece by the artist Onefin, originally from Pokémon Super Mystery Dungeon , which uses solemn keys like G minor and F minor to evoke deep melancholy.