I’m going by what the loonie-- er, I mean…Faithful & Devout in Times Square are saying. And they’re calling it “Judgement Day.”
What, 20 posts and no mention of Dies Irae? That’s exactly what it’s written for! Besides, no apocalypse could possibly be complete without ominous Latin chanting.
We also need Ride of the Valkyries…and choppers…with loudspeakers and machine guns and rocket launchers…
Speaking of Lain – Miserabile Visu (Ex Malo Bonum) - Anberlin. Sort of like an epic apocalypse song but light on violent imagery.
Closing Time-- Leonard Cohen
I think the obvious choice, be it the ‘good folks’ being pulled into heaven or some sort of nuclear armageddon…
Walking on sunshine - Katrina and the waves.
“Five Years” - David Bowie
“Hell Awaits” - Slayer
“Paint It, Black” - the Rolling Stones
Great Balls of Fire - Jerry Lee Lewis
Bat out of Hell - Meatloaf
Bodies - Drowning Pool
Ode to Billy Jack
Won’t be any trumpets blowing
Come the Judgement Day.
On the bloody morning after
One tin soldier rides away.
SLAYER!!! Play all of Reign In Blood, followed by any Maiden with sprinkles of Metallca in between.
Chill, serves many. 
“The Earth Died Screaming” - Tom Waits
“A Hard Rain’s Gonna Fall” - Bob Dylan
“Black Hole Sun” - Soundgarden
“Gimme Shelter” - Rolling Stones
It always struck me as “Apocalypse Rock”.
“Spirit in the Sky” by Norman Greenbaum
OMG, I think this one wins the thread! How could I have forgotten?
You want it in Latin, or one of the English translations? I know Latin would sound cooler, but if you can’t understand what you are in for it doesn’t mean as much.
“When the Saints Go Marching In” (Pick a version. Nothing like an uptempo jazz song about the end of the world to celebrate the end of the world.)
“I Melt With You” – Modern English (Well, okay this song is about having sex when the nuclear apocalypse starts, but most 1980’s songs that dealt with (or metioned in passing) end of the world scenarios were about nuclear war (99 Red Baloons/Luftbalons; 1999; Wild Wild West, etc.))
Another good post-apocalyptic song is “Future Legend/Diamond Dogs” by Bowie.
“God Save the Queen” by the Sex Pistols ends with “No future, no future, no future for you/No future, no future, no future for me.”
You could also include “Let’s Live for Today” by the Grass Roots and “Forget Domani” by Connie Francis or Frank Sinatra or Perry Como or any of a variety of others.
The classic-rock station here in Chicago, WDRV, has a regular feature, “10 at 10”; normally, at 10am on weekdays, they play 10 songs from the same year. Occasionally, they do a special theme for the show – today’s theme was “the end of the world” (the final song of the 10 just played). The list for today’s show:
Babe I’m Gonna Leave You - Led Zeppelin
End of the Line - Traveling Wilburys
Armageddon It - Def Leppard
Homeward Bound - Simon & Garfunkel
I Know I’m Losing You - Temptations
Elevation - U2
2000 Light Years From Home - Rolling Stones
Ashes to Ashes - David Bowie
Knockin’ on Heaven’s Door - Bob Dylan
It’s the End of the World as We Know It - R.E.M.
Two U2 mentions without “Until the End of the World”?
Also:
Tool - Aenima
Def Leppard - Armegeddon it
Linkin Park - In the End
Fade to Black - Metallica (I thought Creeping Death, but that’s really more about Passover)
Billy Joel - Miami 2017 (Seen The Lights Go Out On Broadway)
Rush - Red Tide
Bob Dylan or Jimi Hendrix - Along the Watchtower
Iron Maiden - Number of the Beast (also The Prophecy)
I’m in the process of listening to the following while I do the dishes:
Jimi Hendrix: 1983… (A Merman I Should Turn to Be)
Chris Cornell: Preaching the End of the World
Nirvana: Lithium [cult-related, not Doomsday in particular]
Bad Religion: Fuck Armageddon… This is Hell
Beatles: Tomorrow Never Knows
When the Man Comes Around. You’re right about that, so I’ll listen to that, and, what the hell, his version of God’s Gonna Cut You Down.
Or the Bill Hicks bit that inspired it, “Goodbye You Lizard Scum” (the leadoff track from the Arizona Bay album).
Actually just “The Man Comes Around.”