MODs another very interesting format. MP3s which is a very interesting format. It is mostly illegal, but it is widely used anyway. This something entirely different. Koan requires the addition of a plug-in to your browser to enable playing the files.
Koan music is written to designated sound cards.
The Sound Blaster AWE is the best as far as I know. I just have an ordinary Sound Blaster 16, and there is also a lot of good Koan music for that. All versions of Windows have built-in players for the Wav and Midi files, so you do not have to think of that. But you need plugins, a little program to replay the tunes. These players are freely available on the Internet - I'll give you the links later.