If you would like to subscribe to the FIA listserve, send a blank message to:
friendsinart+subscribe@groups.io

If you would like to subscribe to midimag, which is a list for sight-impaired musicians that deals with far more than MIDI, send a blank message, devoid of signatures, to:
midimag-request@freelists.org
with the word subscribe in the subject line.

Alternatively, you may go to:
the Midimag freelists page
fill in your email address in the edit field, choose subscribe from the dropdown list (it is the default selection) and press the 'submit' button

In any event, click the confirmation link in the email you receive, and you're golden.

You may contact midimag-owner@freelists.org for assistance if required.