The MIDI version of this music represents the accompaniment to the keyboard input. The piano is played along with the MIDI file to produce the final mp3 file Click the Play/Download MIDI File link. This will play the MIDI file in Media Player or the player you have configured. Right clicking on the same link will bring up a dialog box. Select the Save As option and you will be given a choice of a directory on your computer to save the file.
When you navigate to the directory where your file is saved, you will find the downloaded file with a .mid extension. Double clicking on this file will bring up the default media player in your computer and you can listen to the file. Like any file, it can be played in another program or sent to an external player, or to internal or external storage. You can play along with this file to produce your own version of the music.