The downside with MIDI files is that the reader (or should I say listener) must have an extension installed that can handle playback of MIDI files and that you don't know exactly how it is going to sound.
KM's Multimedia Plug is one of many Netscape Navigator extensions that are able to handle MIDI files if QuickTimeTM Musical Instruments are installed in the readers systems.
Use the topic Embedded Object : Audio in HTML Assistant to add MIDI music to your page. The HTML tags for the example above looks like this:
<EMBED SRC="wheels.mid" WIDTH="146" HEIGHT="16" AUTOSTART=True LOOP=True CONTROLLER=True CONTROLS=SMALLCONSOLE><NOEMBED><A HREF="wheels.mid">[Play Music]</A></NOEMBED>
Note that the attribute CONTROLS=SMALLCONSOLE
is required to make the LiveAudio plug-in (distributed with Navigator 3) display a visible control.
Also note that some beta versions of Netscape Navigator and Internet Explorer doesn't seem to work with midi audio files like the one provided with this example.