Try borrowing discs from your local library with some of the following (some of which have already been suggested), which are selected primarily for melodic appeal and familiarity):
1812 Overture -- Tschaikovsky
Night on Bald Mountain and/or Pictures at an Exhibition -- Mussorgsky
Brandenburg Concertos -- Bach
Bach Organ Music, Toccata and Fugue in D Minor and/or Passaglia in C
Eine Kleine Nachtmusik -- Mozart
William Tell Overture (Lone Ranger Theme) -- Rossini
Light Cavalry Overture -- Suppe
Beethoven -- Symphony No. 5 (Then nos. 6, 7 and 9)
Themes on a Variation by Paganini -- Brahms
Hungarian Rhapsody No. 2 -- Liszt
Waltzes by Strauss (Johann)
Rodeo and/or Appalachian Spring -- Copland
Canon in D -- Pachelbel
Have fun and good luck!
1812 Overture -- Tschaikovsky
Night on Bald Mountain and/or Pictures at an Exhibition -- Mussorgsky
Brandenburg Concertos -- Bach
Bach Organ Music, Toccata and Fugue in D Minor and/or Passaglia in C
Eine Kleine Nachtmusik -- Mozart
William Tell Overture (Lone Ranger Theme) -- Rossini
Light Cavalry Overture -- Suppe
Beethoven -- Symphony No. 5 (Then nos. 6, 7 and 9)
Themes on a Variation by Paganini -- Brahms
Hungarian Rhapsody No. 2 -- Liszt
Waltzes by Strauss (Johann)
Rodeo and/or Appalachian Spring -- Copland
Canon in D -- Pachelbel
Have fun and good luck!