I must lack some sort of distinctive sense for music styles. For me it just sounds like a classical piece... That said, on the topic of classical music, I really like Danse Macabre. I first heard it as a child while playing 102 Dalmatians Puppies to the Rescue. It was a Carnival theme. Then I heard it again this year, but in Mewgenics! I was surprised to find out that this is actually about death.
There's also a version with vocals I like too.