Symphonies. The kind of composition that made him immortal... or better said, he made himself immortal by composing the greatest instrumental pieces of music ever heard.
3rd (Edit: new link):
5th:
6th:
7th:
Very few composers have come close to those four, but regarding symphonies, everything pales in comparison to his ninth, in particular the grand first movement (Edit: new link):
There are thousands of princes, but there's only one BEETHOVEN. Music for the ages!
Every year, the starlings are eating all cherries from my trees a week before being ripe, but that's OK, as long as they keep on doing this awesome stuff. Magnificient!