Most achingly-beautiful music

there are many, but here's my selection in no particular order of emotion or mood:
Across the universe - The Beatles
Me and Bobby McGee (acoustic version/demo) - Janis Joplin
Old Man - Neil Young
Birdland - Patti Smith
Working Class Hero - John Lennon
Moonshadow - Cat Stevens
Town called malice - The Jam
At last - Etta James
Je t'aime, je ne t'aime plus - Patricia Kaas
Love grows - The Siddeleys
For What It's Worth - Buffalo Springfield
America - Simon & Garfunkel
Blackbird - The Beatles
Death Singing - Patti Smith
Only A Hobo - Rod Stewart
Immigrant Song - Led Zeppelin
Bang Bang Bang - Tracy Chapman
Testament - Boudewijn de Groot
Freebird - Lynyrd Skynyrd
London Calling - The Clash
Milord - Edith Piaf
Green Onions - Booker T. & The MG's
I can't give you anyhting but love - Duke Ellington
Love the one you're with - Crosby, Stills, Nash & Young
Highway 61 revisited (live) - Johnny Winter
and just for laughs:
Ca plane pour moi - Plastic Bertrand
Mama Looka Boo Boo (Shut Your Mouth - Go Away) - Robert Mitchum

River of Sorrow, painfully beautiful.

Radiohead live

Delirium and their song Kharma.

Glenn Gould's music for Vonnegut's movie, Slaughterhouse Five.

Pink Floyd's Shine On You Crazy Diamond, parts 1-9

Donny Osmond-Little Lover Boy (ok, that's a joke!)

Frank Zappa-Watermelon in Easter Hay