I would recomend the following:
Baroness Rodmilla de Ghent: Symphony No.3
Tchaikovsky: Marche Slave
Mendelssohn: Symphony No.4 'Italian'
Berlioz: Symphonie Fantastique
Mozart: Le nozze di Figaro
Chopin: Piano Concerto No.1
Sullivan: 'Irish' Symphony
Beethoven: Symphony No. 9
Verdi: Aida
Wagner: The Ring cycle
Haines: 'Le Merchand'
Scott: 'The Duchess of York'
Shostakovich: Festive Overture
Tchaikovsky: Swan Lake
Berlioz: Harold in Italy
Liszt: Hangarian Rhapsody No.1
Rachmaninoff: Piano Concerto No.3
Mozart: Don Giovanni
Rossini: William Tell
Mozart: Clarinet Concerto
Elgar: Pomp and Circumstance march No.1
Dukas: The Socerer's Apprentice
Pierne: Entance of the little Fauns
Liadov: A Musical Snuffbox
Brahms: Hungarian Dance No.5
Wagner: Tannhauser
Respighi: The Birds
Handel: The Water Music
Bach: Orchestral Suite No.3
Faure: Spanish Suite from 'Dolly's Suite'
Debussy: Clair de Lune
Saint-Saens: Carnival of the Animals
Haines: Symphony no. 10
Bizet: Carmen
Tchaikovsky: 1812 Overture
Strauss: The blue Danube
Dvorak: Symphony No.9
Purcell: 15 Fantasias for viols
Vivaldi: Gloria in D
Rameau: Platee
Handel: Zadok the Preist
Bach: St John Passion
Gluck: Armide
Haydn: Nelson Mass
Mozart: Cosi fan tutte
Beethoven: Fidelio
Weber: Bassoon Concerto
Rossini: The Barber of Seville
Schubert: The Trout Quintet
Donizetti: Anna Bolena
Scott: Symphony No. 14
Bellini: Oboe Concerto
Berlioz: Te Deum
Mendelssohn: Octet for Strings
Chopin: Fantasy in F minor
Schumann: Cello Concerto
Sullivan: Macbeth Overture
Liszt: Faust Symphony
Wagner: Parsifal
Verdi: Nabucco
Franck: Symphonic Variations
Smetana: Ma Vlast
Bruckner: Te Deum
Strauss II: Morning Papers
Brahms: German Requiem
Saint Saens: Dnase Macabre
Bizet: Symphony in C
Tchaikovsky: The Nutcracker
Dvorak: Rusalka
Grieg: In Autumn
Elgar: Enigma Variations
Puccini: Tosca
Mahler: Das Lied von der Erde
Scott: Liebst Mich
Haines: Symphony no.12
Debussy: La Mer
R. Strauss: Don Juan
Sibelius: En Saga
V. Williams: Linden Sea
Rachmaninoff: Vocalise
Schoenberg: Variations for Orchestra
Ravel: Bolero
Mussorgsky: Pictures at an Exhibition
Bartok: String Quartets
Stravinsky: The Rite of Spring
Prokofiev: Peter and the Wolf
Sibelus: In the Arabian Desert
Bartok: Lapus Lazuli
Kampf: General Opulence
Yulis Fo: Lichen Huyinj
Mozart: Poliferary
Tai Min: Asiana Bliss
Scott: Burlief
Haines: In His Eyes
Verdi: Wilo
Kampf: Ovorio
Coloque: Greil Road
Hayes: Road to Perdition
Freais: Hell is Coming
Sibelius: The Day Heaven and Earth Collided
Gershwin: Rhapsody in blue
Shostakovich: Piano Concerto No.2
Britten: Peter Grimes
Monteverdi: Ariadne’s Lament
Purcell: The Fairy Queen
Vivaldi: The Four Seasons
Rameau: Zoroastre
Handel: Messiah
Bach: The well tempered Clavier
Gluck: Orfeo ed Euridice
Haydn: Symphony No.100
Mozart: Symphony no. 41
Beethoven: Fur Elise
Weber: Clarinet Concerto
Rossini: Stabat Mater
Schubert: Unfinished symphony
Donizetti: The Elixir of Love
Bellini: Norma
Berlioz: Requiem:
Mozart: Requiem
Chopin: Polonasies
Liszt: Les Preludes
Wagner: Die Walkure
Verdi: Otello
Smetana: Salon Polkas
Bruckner: Symphony No.9
Haines: La Chasse
Scott: A Bird in the wind
Brahms: German Requiem
Saint Saens: Septet in E-flat
Bizet: The Peral Fishers
Tchaikovsky: Romeo and Juliet
Dvorak: Slavonic Dances
Grieg: Piano Concerto
Elgar: Sea Pictures
Puccini: La Boheme
Mahler: Symphony no.8
Debussy: Jeux
R. Strauss: 4 Last songs
Sibelius: Finlandia
V. Williams: Symphony no.1
Rachmaninoff: Five Pieces
Schoenberg: Piano Concerto
Ravel: La Valse
Bartok: Concerto for Orchestra
Stravinsky: The Firebird
Prokofiev: Piano Concerto
Gershwin: Porgy and Bess
Shostakovich: The Age of Gold
Britten: War Requiem
Satie: Gymnopedie No.1
Beethoven: Moonlight Sonata
Sinding: Rustle of spring
Liszt: Un sospiro
Brahms: Inermezzo
Granados: Spanish Dnaces
Mozart: Fantasia in D minor
Purcell: The Double Dealer
Haines: The Grand King
Settin: War of Britain
Scott: 'Welsh' Symphony
Hobson: Goodbye
Tain: Anglo Symphony
Mussorgsky: A Night on a Bare Mountain
Stravinsky: Symphony in 3 movements
Strauss II: Hungarian Polka
Haines: Concerto for Violin and Orchestra
Scott: 'Grand' Symphony
I also might recommend some composers if you want to further you're liking for classical music:
Renaissance era:
Hildergard of Bingen (German)
Guillaume de Machaut (French)
Guillaume Dufay (Flemish)
Johannes Ockeghem (Flemish)
Josquin des Prez (Flemish)
Giovanni Pierluigi da Palestrina (Italian)
Orlande de Lassus (Flemish)
Tomas Luis de Victoria (Spanish)
Thomas Tallis (English)
William Byrd (English)
Carlo Gesualdo (Italian)
Gilles Binchois (Bergundian)
Adriaan Willaert (Italian)
Baroque era:
Claudio Monteverdi (Italian)
Heinrich Schutz (German)
Jean-Baptiste Lully (French)
Arcangelo Corelli (Italian)
Henry Purcell (English)
Antonio Vivaldi (Italian)
Johann Pachelbel (German)
Dietrich Buxtehude (Dnaish)
Johann Sebastian Bach (German)
George Frideric Handel (German)
Domenico Scarlatti (Italian)
Jean-Philippe Rameau (French)
Gregorio Allegri (Italian)
Alessandro Scarlatti (Italian)
Giovanni Battista Pergolesi (Italian)
Giuseppe Tartini (Italian)
Francois Couperin (French)
Georg Philipp Telemann (German)
Johann Hasse (German)
Classical era:
Christoph Willibald Gluck (German)
Joseph Haydn (Austrian)
Wolfgang Amadeus Mozart (Austrian)
Thomas Arne (English)
Carl Philipp Emmanuel Bach (German)
Johann Christian Bach (German)
Domenico Cimarosa (Italian)
Antonio Salieri (Italian)
Luigi Boccherini (Italian)
Giovanni Paisiello (Italian)
Franz Schubert (Austrian)
Ludwig van Beethoven (German)
Romantic era:
Ludwig van Beethoven (belongs in both)
Gioacchino Rossini (Italian)
Gaetano Donizetti (Italian)
Vincenzo Bellini (Italian)
Carl Maria von Weber (German)
Giacomo Meyerbeer (German)
Niccolo Paganini (Italian)
Hector Berlioz (French)
Felix Mendelssohn (German)
Frederic Chopin (Polish)
Robert Schumann (German)
Franz Liszt (Hungarian)
Charles Gounod (French)
Georges Bizet (French)
Luigi Cherubini (Italian)
Daniel-Francios-Esprit Auber (French)
John Field (Irish)
Franz Berwald (Sweedish)
Jacques Fromenthal (French)
Mikhail Glinka (Russian)
Mily Balakirev (Russian)
Alexander Borodin (Russian)
Modest Mussorgsky (Russian)
Nikolay Rimsky-Korsakov (Russian)
Pyotr Ilyich Tchaikovsky (Russian)
Bedrich Smetana (Czech)
Antonin Dvorak (Czech)
Edvard Grieg (Norwegian)
Isaac albeniz (Spanish)
Enrique Granados (Spanish)
Arthur Sullivan (English)
Jacques Offenbach (French)
Johann Strauss (Austrian)
Johann Straus II (Austrian)
Emmanuel Chabrier (French?)
Edouard Lalo (French)
Johan Svendsen (Norwegian)
Christian Sinding (Norwegian)
Johannes Brahms (German)
Anton Bruckner (Austrian)
Giuseppi Verdi (Italian)
Richard Wagner (German)
Gustav Mahler (Austrian)
Edward Elgar (English)
Jean Sibelius (Finnish)
Cammile Saint-Saens (French)
Gabriel Faure (French)
Giacomo Puccini (Italian)
Richard Strauss (German)
Sergei Rachmaninoff (Russian)
Karol Szymanoski (Polish)
Alexander Glazunov (Russian)
Hugo Wolf (Austrian)
Max Bruch (German)
Hubert Perry (English)
Paul Dukas (French)
Vincet d'Indy (French)
Charles Villers Stanford (Irish)
Twentieth Century:
Claude Debussy (Fench)
Maurice Ravel (French)
Erik Satie (French)
Alexander Scriabin (Russian)
Ferruccio Busoni (Italian)
Ralph Vaughn Williams (English)
Gustav Holst (English)
Frederick Delius (English)
Leos Janacek (Czech)
Bela Bartok (Hungarian)
Zoltan Kodaly (Hungarian)
Carl Nielsen (Danish)
Arnold Schoenberg (Austrian)
Alban Berg (Austrian)
Anton Webern (Austrian)
Kurt Weil (German)
Francis Poulenc (French)
Igor Stravinsky (Russian)
Sergei Prokofiev (Russian)
Paul Hindemith (German)
William Walton (English)
Ottorino Respighi (Italian)
Manuel de Falla (Spanish)
Aram Khachaturian (Armenian)
Constant Lambert (English)
Philip Heseltine (English)
Dimitri Shostakovich (Russian)
Benjamin Britten (English)
Olivier Messiaen (French)
Sir Nathan Scott (English)
Joshua Haines (English)
Baroness Rodmilla de Ghent (French)
That's just for starters.....