It appears that there was a time when anyone using the WordPress hosting system COULD include a utility to play midi files. However, for some reason - maybe the process was being abused, or the owners of the site (WordPress) felt it placed too much strain on thir resources, this option was explicitly removed.
As I understand it, this is now not possible. There may well be no way around this, although maybe they offer extra levels of service, maybe at a cost to you, which might allow this.
You should look into the details of their Terms of Service to see if there are options available to you.
OK, These may work, but my understanding is that WordPress have explicitly prevented the use of anything but 'approved' plugins/extensions, and if your progs are not on their list, they will not be allowed.
If they DO work, please let us know so that I can update my notes.