Well, since you said ten pieces, I'm going to label entire masses, operas, volumes, etc. as a "pieces".
1)Bach - Mass in b moll
2)Bach - The Well Tempered Clavier
3)Bach - Goldberg Variations
4)Bach - Magnificat
5)Mozart - Mass in c moll
6)Mozart - Requiem
7)Beethoven - Mass
8)Schumann - Frauenliebe und -leben, Op. 42 9)Brahms - Deutche Requiem
10)Chopin - Concerto in e moll
Mozart Requiem
Handel's Messiah
Rachmaninoff"s 2nd Piano Concerto(no, wait, it premiered in 1901. Rats!)
Spem in Alium by Thomas Tallis(There's one you won't hear every day.)
Carnival Overture by Dvorak
I can't pick just 10, so I think I will just bring my whole collection. It isn't very large(yet), only about 250 titles. When I get up to the thousands, then I will make a desert island list. Nyah!
Bach's Orchestral Suites all of them ("Air on G" is from Suite #3)
Allegri's Misere Anyone who loves choral music should hear this, especially around Lent
Mozart's Marriage of Figaro, The Magic Flute (that'll get anti-Masons going)
Verdi's La Traviata
Widor's Symphony No. 5 in f minor for organ--the Toccata movement is wild--try playing it
Bach's Unaccompanied Suites Luminous and absolutely scary to play--no place to hide
Bach's Magnificat The Gloria movement is fabulous (especially is is you're in the middle of the chorus behind the orchestra)
Too bad we can't include Barber's Adagio for strings and Rachmaninoff's Fourth Concerto