For me:
Baroque:
All of Bach's violin pieces
"Air on the G String" (also Bach)
Vivaldi 4 Seasons
Classical:
Anything Mozart, but particularly his Violin Concerto no. 5 (I think no.5) it was one of my jury pieces
All 9 of Beethoven's symphonies (the first few are more classical than Romantic pieces, but I generally count Beethoven as being a Classical era composer)
Beethoven Violin Concerto
Rossini's Barber of Seville
Romantic:
Anything Tchaikowsky, but particularly his 5th and 6th symphonies, and his violin concerto.
Dvorak's "New World Symphony"
Dvorak's 8th Symphony
Dvorak's Cello Concerto
Berlioz's Symphonie Fantastique
Dvorak's Slavonic Dances
Brahms Symphony No. 1 and all of his others, but 1 most of all
Modern:
Mussorgsky's Pictures of an Exposition
Prokofiew's Lt. Kijé
Prokofiew's Soundtrack to Alexander Nevsky
Prokofiew's Communist National Anthem (forget the name, but it's my favorite national anthem)
Orff's Carmina Burana (sp)
Copeland's work is all good, well, except for the vocal things.
Plenty more, but those are a few.
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