The midi file should start playing automatically. There is a link to the file to play it or download as well

All of the midi files are used as background music in the postcard section, So send your friends a postcard.

To save file to your system, you may have to press left mouse key and click save target as, clicking the normal way will work, but it will probally open up some kind of media player and then you will have to save it through the media player