What classical / orchestral song is this?

Beethoven's ninth symphony. fourth movement.

http://www.youtube.com/watch?v=Iq-3B6xfNpY

Ode to Joy is the poem used for the lyrics, not the song's name.... It's symphony 9 by Beethoven, nicknamed Choral Symphony; it was the last symphony he wrote, and is credited to creating the Romantic Era of music (1815-1900)

Ode to Joy, from Beethoven's 9th Symphony

This is "Ode to Joy", which is the theme from Beethoven's 9th Symphony.

Beethoven Sym #9 "Choral" 4th movement "Ode to Joy"

How about the first movement of Beethoven's "Moonlight" Sonata? Perhaps you might try the second movement of Mozart's Piano Concerto Number 21 (from the movie "Elvira Madigan").