Most achingly-beautiful music

Mahler: Ich bin der Welt: from Ruckert Songs
Mahler: Der Abschied: from Das Lied von der Erde
Mahler: Adagietto: from Symphony No. 5
Rachmaninov: 18th variation from Paganini Variations
Korngold: Marietta's song: from Die tote Stadt

The renditions of these pieces that I prefer are respectively:

(1) Janet Baker
(2) Janet Baker or Brigitte Fassbaender or Dietrich Fischer- Dieskau (with Kletzki, but NOT Bernstein)
(3) Barbirolli/New Philharmonia
(4) Stephen Hough, Andrew Litton/Dallas SO
(5) Renee Fleming

Not sure if anyone has mentioned it already, but Warren Zevon's cover of "Knockin' on Heaven's Door" is both beautiful and a heartstring-tugger, given that he recorded it in the last month's of his life.

My vote is for Mozarts Eine Kleine Nacht Musik, Budapest String Quartet. My Lp is old and worn- wish i could find another copy.
Another which moves me is Django's "Nuage". My favorite is on a French label CD. There are many poor recordings of Djangos music which do not do him justice. But he had the FIRE (no pun intended, no disrespect).
One more, Otis Reddings- Try A Litlle Tenderness.
Great Thread!!!

Chet Baker's "The touch of your lips" 1979 / Copeland's "Fanfare for the Common Man" - MN Orchestra - Prof Johnson HDCD / Bukkene Bruse "Wedding March from Osterdalen" Northside 2002 sampler

Many choices, but Vaughan William's 5th symphony comes to mind.