most beautiful song

[MartheAbbott]

"Magnificent" done by the group U2, from their album "No Line On The Horizon".

[el ايمان]

Beautiful in what regard?

[Rainbow]

"Ave Maria", is the most beautiful song for me.
I know there are plenty of musical compositions.
"Led Zeppelin", "Deep Purple", "Charles Aznavour", Greig, Chopin, Gershwin, etc. Nothing comes close to "Ave Maria". Nothing.

[Zeebadee]

Two immediately come to mind:

Beim Schlafengehen, by Dame Kiri Te Kanawa
YouTube - ‪Dame Kiri Te Kanawa: Strauss- Four Last Songs, 'Beim Schlafengehen'‬‏

Meditation de thais, by Sarah Chang
YouTube - ‪Meditation de Thais, Sarah Chang‬‏

Hope you like them.

[Esmira]

Andjele (Angel) YouTube - ‪Milan Stanković - Opet će se rode vratiti (LYRICS ON SCREEN)‬‏

If you like Il Divo, you'll love these guys.

[tinybear]

YouTube - ‪Boyzone - No Matter What‬‏

[frosty6731]

YouTube - ‪Olga Peretyatko, Exsultate Jubilate, Mozart part 1‬‏

[Muckraker]

(Some of the songs are not recorded well on Youtube)

I think Corpus Christi Carol - Jeff Buckley takes top honors for me:
YouTube - ‪Corpus Christi Carol‬‏

Runners up:

Bowie - It's Gonna Be Me
YouTube - ‪David Bowie - It's Gonna Be Me‬‏

Beth Gibbons - Show
YouTube - ‪Beth Gibbons - Show‬‏

Radiohead - Nude
YouTube - ‪Radiohead - Nude‬‏

Iron & Wine - Fever Dream
YouTube - ‪Iron & wine - fever dream‬‏

Grandaddy - Where I'm Anymore
YouTube - ‪Where I'm Anymore "Grandaddy"‬‏