With over 300 years of music to look back on and a heapload of it up on YouTube, it can't be too hard.
Monteverdi - Vespro Della beata Vergine
http://www.youtube.com/watch?v=-CF4EQLBWlo
J.S. Bach - Brandenburg Concerto #4 in G Major
http://www.youtube.com/watch?v=rPG21R2thJ4
J.S. Bach - Mass in B minor
http://www.youtube.com/watch?v=j2uppzm7dPE
Haydn - Symphony #22 in E-flat major
The Philosopher
http://www.youtube.com/watch?v=Zam5T0JPDmg
Mozart Mitridate, re di Ponto
http://www.youtube.com/watch?v=CFtsaUFrvUU
Mozart - Symphony #38 in D major
Prague (Allegro kicks in at about 2:35)
http://www.youtube.com/watch?v=IulPPkoU03k
Mozart - Piano Sonata #11 in A major
http://www.youtube.com/watch?v=HADtL7a6wxg
Beethoven Violin Concerto in D major
http://www.youtube.com/watch?v=S9K9b17e4JU
Beethoven- Symphony #7 in A major
http://www.youtube.com/watch?v=s8eigkwmMEo&fmt=18
Beethoven - String Quartet #16
http://www.youtube.com/watch?v=CBPvR5rm-uI
Verdi - Nabucco (Overture)
http://www.youtube.com/watch?v=5UjZ5d9Q4xA&fmt=18
Wagner - Tannhauser (Pilgrim's Chorus)
http://www.youtube.com/watch?v=299iYHF4x1s
Wagner - Tristan und Isolde (Liebestod)
http://www.youtube.com/watch?v=RLoHcB8A63M&fmt=18
Wagner - Das Rheingold (prelude)
http://www.youtube.com/watch?v=wiyoLa9z1ao&fmt=18
Liszt - Hungarian Rhapsody #2 in C-sharp minor
http://www.youtube.com/watch?v=goeOUTRy2es
Liszt - Orpheus
http://www.youtube.com/watch?v=IxngyYmQU8Y
Bartok - String Quartet No. 4
http://www.youtube.com/watch?v=woFZkFqBu1w
Stravinsky - Petrushka
http://www.youtube.com/watch?v=VlrrllC927o