What is the most "heavenly" music you 've heard?

Miserere mei, Deus

Miserere (full title: Miserere mei, Deus, Latin for "Have mercy on me, O God") is a setting of Psalm 51 (Psalm 50 in Septuagint numbering) by Italian composer Gregorio Allegri. It was composed during the reign of Pope Urban VIII, probably during the 1630s, for the exclusive use of the Sistine Chapel during the Tenebrae services of Holy Week, and its mystique was increased by unwritten performance traditions and ornamentation. It is written for three choirs, two of five and four voices respectively, with a third choir singing plainsong responses, each singing alternately and joining to sing the ending in one of the most recognised and enduring examples of polyphony, in this case in a 9-part rendition.

Came here to say this
+1

Mason Williams - Classical Gas:

https://www.youtube.com/watch?v=1EnwvdaBpFQ

Bonobo - Interlude + Kiara:

https://www.youtube.com/watch?v=D9f2KZvf9sk

Zero 7 - Look Up:

https://www.youtube.com/watch?v=nvGlcrLzM4w

Air - La Femme D'Argent:

https://www.youtube.com/watch?v=YUX8fUrKRNU

Thievery Corporation - Lebanese Blonde:

https://www.youtube.com/watch?v=1t7W6NtTKAw

Simon and Garfunkel - Scarborough Fair:

https://www.youtube.com/watch?v=-Jj4s9I-53g

Game of Thrones Intro:

https://www.youtube.com/watch?v=TZE9gVF1QbA

Boom Bip - Roads Must Roll:

https://www.youtube.com/watch?v=U7DYYQ4q4Go

Last but not Least:

https://www.youtube.com/watch?v=U9OQAySv184

That whole Air album is amazing.
- You should listen to the zero 7 - look up track if you haven't already. Its very good.

Dark Side Cowboys - Eclipse

Clair de lune (Debussy)

Yas. Also arabesque But slowed way the fuck down

Anything bagpipes

Peppino D’Agostino - Closer to Heaven

Samuel Barber - Adagio for Strings

Adagio for strings usage in the original home world game was one of the most impactful moments in entertainment for me across all mediums.
- This is exactly what came to mind when I read the question. Unbelievably cinematic moment. Still one of my favorite strategy games.

Akira Yamaoka - Resting Comfortably

https://youtu.be/3sry34AOwlU

Gravelike by Phillip E Morris

https://www.youtube.com/watch?v=ZlAhkaJkXWY

Off to sleep - Coeur de pirate is close

https://youtu.be/JlcCRndg1KI

The made in abyss OST.

Max Richter - On the nature of daylight

Stairway to Heaven

I go through changes but some really chill pieces I have liked over the years are:

Clannad - Coinleach Glas An Fhómhair (Cantoma Mix) https://www.youtube.com/watch?v=qo3Vhmv8cxw

Enya - Echoes In Rain https://www.youtube.com/watch?v=wdKfQJSHWEY

Thievery Corporation - Nos Dois https://www.youtube.com/watch?v=rbt78buj80Q

Final Fantasy VII - Tifa's Theme (Pianoピアノ） https://www.youtube.com/watch?v=PCS5yfXbSbE

Dolphin Boy - Shake it Loose https://www.youtube.com/watch?v=pyWIBup6eFE

Well this a oddly specific timed post for me! As just yesterday I was able to have a listen to this badboy from Avantgarde Acoustics company. This is the TRIO G3 and is a horn speaker rather than a "normal" speaker. It was absolutely insane to listen to. You could play it so insanely loud without any added distortion and the clarlity was crystal clear. Hands down one of the coolest - or - most heavenly experiences I've had in a while! Highly recommend going to a local HiFi center where they might have these to have a listen. I'm not an audiophile whatsoever and thought this was by far the best speakers I've ever listened to.

Elden Ring - Miquellas Theme

Warszawa by David Bowie sounds like if heaven was really sad for a day. But still heavenly

I'm looking for warmer if that makes sense but i will check it out nonetheless
What do you think of Moss Garden?
- I haven't gotten around to listening to all of Heroes yet so I'll have to get back to you on that. Thanks for deciding what album I'm gonna listen to first today though lol

Requiem for a Dying Planet was the sound scape for Werner Herzog's Wild Blue Yonder. A brilliant film backed by this album, I feel that the album stands on its own.

This recording brings together three very disparate elements into a synergistic whole. They are Ernst Reijseger’s cello, the choral singing of the Sardinian group Tenore e Cuncordu de Orosei and the soaring vocals of Senegalese singer Mola Sylla. Each is a singular expression of music from widely differing traditions; together, they’re indescribable.
Requiem For a Dying Planet is not the anticipated death song for the earth, this music is dedicated to this wonderful planet and the beauty of living which could be heavenly if religions would not exist.”

Bulgarian choir singing. It's beautiful, powerful, and a little alien IMO.

"Ergen Deda"

Cosmic Voices from Bulgaria was my first thought as well.
https://youtu.be/UsDtmdWFBxU
https://youtu.be/UUcDKXjR2-8

Sanguisugabogg - Dead As Shit

Creating God - Avenged Sevenfold

...I think it's actually about AI, but this is about as theistic as it gets on my personal playlist.

Shockingly prophetic for something from 2016 - as far as our usage goes, it nailed it.

Libera Ave Maria (Caccini) Remix

Can't beat a Christian Orthodox tune :

https://www.youtube.com/watch?v=fiK8wHm4JGM

James O'Donnel's setting of the 139th Psalm

Duane Funderburk - Praise My Soul the King of Heaven

This rendition of And Can it Be gets me as well... Even though it is a guy singing, and everyone kind of joining in, with the steady rhythm. There's something appealing about it.

The Church's One Foundation also works like this

Anything that Steven Wilson has made. Dude's a living legend.

Guess that kind of depends on whether you're going for "sublime serene harmony" or "the unfathomable might of God". I think the church kinda nailed it on both fronts, choirs for the first and pipe organs for the second.

This scene from Mr. Nobody is a great example of the first, which seems a bit more what you're going for.

The Host of Seraphim by Dead Can Dance

https://youtu.be/W29zEuZVaxs

Dimash* Qudaibergen's high end is downright angelic during the climax of the song.

My tastes are very very different from 99.9% of you so I'm not gonna post the one piece that gives me chills and makes me imagine that Heaven is a real place.