Lacrimosa is part of Wolfgang Amadeus Mozart's Requiem, a late 18th century choral work that remains one of the most famous pieces in classical music. The movement became widely reused online because its mournful choir and orchestral rise instantly signal sorrow, doom or exaggerated importance. Short clips of it appear in meme compilations, reaction edits and dramatic video montages, often as a classical counterpart to sounds like Hello darkness my old friend when creators want a more grand and solemn tone.