Most everybody knows about Beethoven's 5th Symphony. I've heard a dozen recordings of it, including ones by Toscanini, von Karajan, and Furtwangler, Gardiner. These names might not mean anything to you now, but classical music lovers eventually develop sort of a crush on this symphony, and particular recordings have particular significance to them.
Admittedly, most of us (yes, obviously I'm one of these people) are a little in awe of this work. This is not a very good thing, because that makes us not get the piece as music, but rather as a sacred relic. It is just a fantastic piece of music in its own right; just sit and listen to the thing.
If this is the first symphony you've listened to, it's rather overpowering, and not in a good way for everyone. The ending alone goes on for quite a while.
This next bit is for those who are new to symphonies. Symphonies are usually in four movements.