Destroyer - Kaputt, really mellow sounds, great for meditation.

http://youtube.com/watch?v=bupiEC3Sayw

The track, Rituals by Sekuoia, is also really nice.

Thanks for all the answers guys, will definitely try all these out :)

you should check out emancipator

http://www.youtube.com/watch?v=gbv-yqqmLH0
http://www.youtube.com/watch?v=ZtZHPW2Y2hI
http://www.youtube.com/watch?v=ROgInqu9-mM

Blazo
The Swapper OST
Kenichiro Nishihara
Miaou
re:plus
The End of the Ocean
Tycho

https://www.youtube.com/watch?v=HYKK7dpT8q0
https://www.youtube.com/watch?v=1HToeZqj4_s

anything by phaeleh/nujabes/emancipator

Psymun
https://www.youtube.com/watch?v=KNEIgz4zhQw

Lone
https://www.youtube.com/watch?v=7XbHhpDo_OM
(the youtube tag things are broken for me on this link for some reason, keeps making it the link above)

https://www.youtube.com/watch?v=s7GQcXktSyU
just some chill beats

I always find First Aid Kit to be relaxing. Even the more up-tempo songs are relaxing. New Album is amazing

P.S. nice music for studying like reading course lit and writing.

https://www.youtube.com/watch?v=q7NiFpy3wWQ (Shine - Kygo Remix)

http://neatbeats.bandcamp.com/album/cosmic-surgery

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

This Will Destroy You - Grandfather Clock https://www.youtube.com/watch?v=bP4L9thuW9o
Clams Casino - I'm God https://www.youtube.com/watch?v=FJJ8hWDXWGs

https://soundcloud.com/broke-for-free

Alt-J's new album leaked a few days ago

http://grooveshark.com/#!/album/This+Is+All+Yours/9787484

https://www.youtube.com/user/OneChilledPanda/videos

Some of the songs are a little too fast paced in my opinion, but there are a ton of good relaxing songs on that channel.

https://www.youtube.com/watch?v=p3VgV31vmUE

https://www.youtube.com/watch?v=S4g7mPUskW8
Saw this with a live band. Pretty spectacular

normally any post rock/ambient/shoegaze stuff i have

i love music but i mean there's been like 20 music threads in the past month jesus

https://www.youtube.com/watch?v=ZG6zsHUCum4

Hendrix

https://www.youtube.com/watch?v=cnHPKKe2B5Q

https://www.youtube.com/watch?v=a7Qt_SMAOcY

https://www.youtube.com/watch?v=uwpoNEkPV8E

https://www.youtube.com/watch?v=Gi1w5DkgVck
good album btw

first aid kit are lovely. voices of angels.

also, mother of mercy, the grandfather of ambient music makes some of the finest chillout music of all time if you don't mind repetition.

https://www.youtube.com/watch?v=5KGMo9yOaSU
https://www.youtube.com/watch?v=j0Sz0lgYhKw
https://www.youtube.com/watch?v=LOpRj927vRc (not the full album, just the first song. the rest of the album is 3 variations on Canon in D; see below for one of them)
https://www.youtube.com/watch?v=z_VluBnUns8
https://www.youtube.com/watch?v=jfdu9pJ7GWk

these are my favorite albums of his. also aphex twin's first two albums (Selected Ambient Works 85-92 and Selected Ambient Works Volume II) are really nice ambient techno, the latter being a lot more chillout in the traditional sense.

https://www.youtube.com/watch?v=Xw5AiRVqfqk
https://www.youtube.com/watch?v=XXW84v_m50Y

e: if repetitious stuff tickles your fancy check this out too
https://www.youtube.com/watch?v=gCkd46hcRag

Mind sharing what you got? I'm interested in post-rock/shoegaze

Here's four songs from my chill playlist:

https://www.youtube.com/watch?v=F-RHLgTe1ow

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

https://www.youtube.com/watch?v=jsNrfPJ77yo

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

http://www.fratmusic.com/playlist/live-easy?autoPlay=true if you like some chill rap

http://asoftmurmur.com/

Customizable ambient sounds such as waves, birds, and fireplaces.

https://www.youtube.com/watch?v=6M6samPEMpM

https://www.youtube.com/watch?v=sko7n07PrGo

perfect for reading a book etc.

For relaxing, I also recommend his more popular Tubular Bells I, II and III.

https://www.youtube.com/watch?v=mWnEx1HQCss