Continuing with my Classical pieces with a theme tradition, I thought I would make a list of really awesome Classical pieces with a fantasy or mythological theme. Fantasy and mythology is the biggest theme in Classical music, it has been the theme for nearly all ballets and the majority of Operas, so it was fairy difficult (see what I just did there?) to cut it down to just a short 20.
see more on Peer Gynt Suite I - In the Hall of the Mountain King
see more on Lemminkäinen Legends, op. 22: II. The Swan of Tuonela