What’s your ideal audience size? A string quartet is hardly appropriate for a 3,500 person hall. A 70-person orchestra can’t be sustained by 10 people (barring unusual and extraordinary wealth). Your ideal audience size tells you about the identity of your group and how to appeal to that group. Maybe your audience is a small number of people interested in specific music. Or maybe a bigger audience has more diverse tastes. Serving your audience means knowing how much you have to serve.