Are there any sites for radio stations and groups that are more accessible? What are the key components to making a site accessible?
To answer your first question, the most accessible radio listening sites I've ever visited belong to some of the aggregators. Radio-locator.com, while it doesn't use headers or regions, is the most accessible radio station site I've ever visited. Pretty much everything on there is text-based (except for the maps--but signal strengths are assigned a number I can read), all of the links are easily and properly marked for screenreaders, and you don't have Flash or refreshing bars moving up and down the pages all of the time.
Worldradiomap.com is another highly accessible site. While it has pages that have thousands of links, the vast majority of those links are properly marked so that screenreader users can easily find what they are looking for.
In the noncommercial sector, Kevin Kelley's publicradiofan.com is very accessible. While some pages have thousands of links, some graphical, nearly all are properly marked for screenreader users.
From my perspective as a blind user, a site that doesn't use a lot of shockwave objects, doesn't refresh itself every minute or so, properly labels links and graphs so that I know what I'm getting when I click on one, and that relies primarily on text information outside of graphs (even with AI, screenreading software still has a difficult time reading text inside of pictures) will earn my attention. The proper use of headers and regions so the screenreader user can zero in on what he/she wants is icing on the cake.
I should note that if PDF documents are not properly marked, they can also give me and other blind people trouble.
Anyway, a good website to visit if you (or anyone else) wants to learn more about how to make sites accessible is
This page gives a high-level introduction to web accessibility and what the W3C Web Accessibility Initiative (WAI) does.
www.w3.org
Finally, there is a site that has annually been evaluating "a million home pages" for accessibility since, I believe, 2019.
webaim.org
It is an excellent place to start if you wish to see how one's home page is ranked in terms of accessibility and, if memory serves, the authors can provide resources if one wishes for more information.