History's most beautiful classical pieces

I have a few favourites from Erik Satie:

Nocturne III
Gnossienne No.5
Pieces Froides - Trois Danses De Travers

These are just my favourite three, but I could pick any Satie piano piece.

Claude Debussy's Etude No. XI pour les Arpeges Composes and Clair De Lune

But possibly the most beautiful piece I've heard so far is Camille Saint-Saens' The Cuckoo in the Heart of the Woods
 
I wouldn't call Wagner's Ride of the Valkyries "beautiful"... epic perhaps but not beautiful... but i do agree on Beethoven's 9th Symphony especially the Ode to Joy part... but here are two more to round off my top 3 at the present time:

Canon in D major for strings and continuo by Johann Pachelbel (the best version is the one conducted by Jean-Francois Paillard)

Etude, Op.10. No.3 in E "Tristesse" by Frederic Chopin (sad but beautiful, about lost love.... it's rumored that Chopin wrote it for a woman he loved in his youth and lost to someone else) << listen to this one and tell me what you think...
 
Hmmmm.... well let me list a few favorites off the top o' me 'ead:

Mozart- Kyrie from C Minor Mass; Concerto for Flute & Harp

Beethoven- Piano Concerto No. 2 adagio; Kyrie from Missa Solemnis

Berlioz- Adagio from Romeo & Juliette

Gorecki- Good Night; Sym. 3

Kilar- Angelus

Tchaikovsky- Sym. 6 4th mvmt.

Mahler- Ruckertlieder; Sym. 10 Adagio

Berg- Violin Concerto