Ricky eat acid
Mogwai
Godspeed! You black emperor
Wild vibes
gorjie hewek
WHITE RAINBOW
Motion sickness of time travel
Older Manitoba is super rad as well.
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detroit
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nɐ˙ɯoɔ˙ʎǝupʎs
little-scale has put out a bunch of chillbro stuff, some drone and some ambient if you're looking for anything chip-related.
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Huddersfield, UK
Grouper – Dragging a Dead Deer Up a Hill
Steve Hauschildt – Tragedy & Geometry
Mark McGuire – A Young Person's Guide To Mark McGuire
Teebs – Ardour
Celer – Capri
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melbourne, australia
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nashville,tn
aww f*ck it im super buzzed:
http://forestbride.bandcamp.com/track/death-kit
a band i put together a few years ago, ambient improv instrumental easy listening muzak. btw mr. tholen-i'd love to see the fruits of yr ms paint regimen at some point, share with us?
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Florida
sugar sk*-*lls wrote:
aww f*ck it im super buzzed:
http://forestbride.bandcamp.com/track/death-kit
a band i put together a few years ago, ambient improv instrumental easy listening muzak. btw mr. tholen-i'd love to see the fruits of yr ms paint regimen at some point, share with us?
Some of it is here: http://forums.tigsource.com/index.php?topic=25000.0
I don't want to post too much cause a lot of the game involves visual storytelling and it could spoil surprises! :0)
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nashville,tn
nice! consider it downloaded upon completion 
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The Hollow Earth
Ah, this thread is right up my alley. Let me see if I can recommend some stuff that hasn't already been mentioned:
Loscil - "Endless Falls" and "Plume" albums in particular are my faves. "Stases" is also great and it's a free download on last.fm
Julien Neto - bascially anything by him that you can get ahold of is friggin' mint
Windy & Carl - not exactly instrumental, but Windy's vocals are so washed out in reverb that they may as well be a synth pad
Klaus Schulze - his "Timewind" LP in particular is a space ambient/berlin school classic
Demdike Stare - supposedly they source all of their sounds from obscure vinyl. Lot's of interesting dark ambient and tribal ambient atmospheres
....and if you don't mind a little chilled downtempo mixed with your ambient:
Solar Fields
Aes Dana
H.U.V.A. Network (a collab between the two aforementioned artists)
Carbon Based Lifeforms
and finally, I would be remiss if I didn't mention my own ambient/dark ambient/drone project Subterrestrial. Here are a few I'd like to recommend:
Conspiracy Music
The City Beneath
Immutable Law
Pre-Columbian Exposition
Nature is Infinite
Forgotten Places
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Boston, MA
a million times yes to everything everyone has posted so far. here's some of my sleepyjam faves that i don't think anyone has mentioned yet:
keith fullerton whitman (some of his stuff is ambient)
eliane radigue (such a beast)
william basinski
jim haynes
julianna barwick
lucky dragons (especially their recent longform stuff)
brendan murray
there's also a really neat looking compilation of suzanne ciani's that just dropped recently!
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Bratislava, Slovakia
I am pretty surprised that many people like Aphex's SAW II, it is really great ambient album and very good also for reading scifi/cyberpunk books which i do nowadays very often.
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brooklyn!
geotic
pretty much the entire 12k label
-taylor deupree
-christopher willits
-fourcolor
-marcus fischer (he also did an amazing collab with deupree)
-illuha
-the boats
-small color
-pillowdiver
bvdub (my personal fave is one last look at the sea, but he has an amazing discography)
stephan mathieu
all 11 years of kompact's pop ambient comps
ironomi
riceboy sleeps/jonsi and alex
kiln (especially the album Holo)
swod
logreybeam (this one might be hard to come by, but it's good ambient glitch)
ulf lohmann
a bunch of people already named all the amazing records that are truly essential, this is an amazing thread. bookmark this.
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Boston, MA
stephan mathieu is incredible. i was just listening to radioland the other day and realized that every time i put it on it blows me away.