How to Use Twitter Lists" page that provides the basics, so I thought I'd just provide one reason I encourage using lists, especially from the get go, as well.
They allow you to keep track of someone whom you might not necessarily want to follow for whatever reason. Maybe they tweet too much for you to want to see in your main news feed, maybe they don't follow many people back. But a list allows you to add both people you follow and those you don't.
Not only that, a list becomes a resource that other people can subscribe too as well, if you make it public (which you should).
All that being said, here are several examples of Twitter lists for artists and arts organizations.
You can use a list for the artists you work with:
Tweets from @ClassActsArts/artist-roster
You can use a list to recognize donors and other supporters:
Tweets from @ClassActsArts/supporters
You can use a list to highlight other local organizations doing similar work:
Tweets from @DancePlace/dc-dance-orgs
Or any other ideas that come to mind. Be creative, think about what's relevant to you and to your audience.
Just one note, you can only have up to 20 lists, so don't go list-crazy.
Have any you want to share? Make 'em and then tweet them to me, @HashtagtheArts.
Let me know what you think,