(not including contemporary orchestral soundtracks, here are some I would choose)
Holst - The Planets (Mars and Jupiter)
Grieg - Anitra's Dance from Peer Gynt
Bach - Presto from Italian Concerto in F major
Bach - Jesu, Joy of Man's Desiring
Kachaturian - Ivan Sings
Debussy - Arabesque #1
Chopin - Fantasie Impromptu
Sinding - Rustles of Spring
Rachmaninoff - Prelude in G minor, Op.23 No.5