https://www.youtube.com/watch?v=gMQCiu4WLjg
What more can I say from my all time favorite game series. The music is so enticing, it brings you to the environment of stealth and espionage. It's so atmospheric, it's unreal. Not to even mention all the 80's songs you can find in Phantom Pain, good selection.
https://www.youtube.com/watch?v=OGr1_qIstlE
Then there is the side game, Metal Gear Rising, which arguably has the best metal soundtrack of any game or movie ever. It's only second to the Dethalbums in terms of fictional metal soundtracks.
https://www.youtube.com/watch?v=DUEjbW4OKEU
As Kaiju mentioned above, Cuphead's music is absolutely fantastic. Seems to be a good trope for indie games, giving a throwback to a couple of years ago to my favorite indie soundtrack, Undertale and more specifically the Genocide Route songs like,
https://www.youtube.com/watch?v=bPCMJC1Ig6s
Breaking from Vidya, some movie soundtracks I love, at least from the top of my head (more specifically specific songs):
https://www.youtube.com/watch?v=6T5izSy-03A
https://www.youtube.com/watch?v=-wjCIocSm54
https://www.youtube.com/watch?v=oIscL-Bjsq4
https://www.youtube.com/watch?v=0V-WGwJJj58
https://www.youtube.com/watch?v=VuJTqmpBnI0 (obligatory)
https://www.youtube.com/watch?v=RyrYgCvxBUg (just one princess song and one villain song for now)
https://www.youtube.com/watch?v=CdqoNKCCt7A
https://www.youtube.com/watch?v=91hGB8YyGt4
That's it for now boy, I'll be hitting this up later