I did, however, start to receive regular emails about their performances since they now had my email. I had unsubscribed in the past but was still receiving their notifications of performances. Beyond the obvious "why would you want to play for a group you wouldn't otherwise see?" bit

So! I decided to very carefully once more unsubscribe from their email list and in the reason why box offered the following tidbit (quoted exactly except for the special part)-
"Wouldn't accept an honest request to audition for a SUB (musician) spot, yet bombard me with emails even after I unsubscribed. Go ---- yourself?"

How have you dealt with what is essentially spam from musical organizations (who have no interest in using you, as is their choice; but latch onto your email address as a possible moneybag)?