The most beautiful song you've ever heard.

[Extragorey]

Pachelbel's Canon. Hands down. Every time I hear it, it instantly turns me melancholy.

Wow... 8.6 million views.

 

[Scarim Coral]

Pretty much these two-
While both songs are odd but I can't help to find the songs to be beautiful and soothing.

 

[Ulvai]

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[Dango]

Absolutely perfect.

Personally, I prefer this version.

Spoiler

I prefer the original. The piano by itself sounds a lot more suitably melancholy to me.

And there's also this:

 

[Claptrap]

For me it's this
So great

 

[wooty]

These would definately be on my top 10 list at least

 

[VanityGirl]

One of the most haunting and beautiful songs I've heard lately was in Red Dead.

Spoiler: Video Spoilers

I also like this song

 

[Jerious1154]

I have two:

 

[ten.to.ten]

Utada - Keep Tryin'. I know probably no one here would agree with that but I don't care, it's stunningly beautiful.

 

[ronald1840]

Never cried from a song before but this did tear me up a little as I was with someone special at the time

 

[EbonBehelit]

Almost everything by Dead can Dance.

Especially The Host of Seraphim though. (Yes, I put it in my post of "saddest song I've ever heard", but it's beautiful for the same reasons.)