It is very important that you put together something that unregistered people can sign. I have several other Rock Mailing Lists that I'm on as well as other bands whose listeners highly respect Stevie & Fleetwood Mac. I'm sure they'd sign as well, but I'm not sure they are all willing to go through the trouble of registering. (I hate registering for different sites and will often abort rather than sign up.)
Let me know when you've created something, if you in fact intend to.