Most achingly-beautiful music

Andrew Latimer's guitar paired with Peter Bardens keyboards on Camel's Flight of the Snow Goose

Minimalism at its best.

Beethoven .... piano sonatas, 2nd movement of 5th symphony.
Mozart requiem. Some parts of Tchaikovsky's Swan Lake are very moving.
Also, there's AC/DC "Rock & Roll Damnation" from the classic Powerage album.

One of these is a facetious answer, can you spot which one it is ? :-)

Saint-Saens & Springsteen. The Swan and the version of The River from the Live in NYC CD/DVD.

Grateful Dead: Terrapin Station