Jesu, Joy of Man’s Desiring by J.S. Bach
Brandenburg Concertos by J.S. Bach
Toccata and Fugue in D Minor by J.S. Bach
Ode to Joy from Symphony No. 9 by Ludwig van Beethoven
Symphony No. 5 by Ludwig van Beethoven
String Quartet in C Sharp Minor by Ludwig van Beethoven
Hallellujah Chorus from The Messiah by George Frideric Handel
Fanfare-Rondeau from the First Suite de Symphonies (the Masterpiece Theater Theme) by Jean-Joseph Mouret
Clarinet Concerto in A Major by Wolfgang Amadeus Mozart
Canon in D by Johann Pachelbel
The Four Seasons by Antonio Vivaldi

A few centuries is not timeless, but it is an indication of long term endurance.