Ms. Iron Tongue, after some dithering: Music I've never heard before, whether old, new, chamber, orchestral, operatic, or early.
My mother to me, earlier this week, somewhat indignantly: I heard a concert today by the daughter of some people I know. I didn't know any of the music on the program and I don't think I had even heard of any of the composers! (after inspecting the program, she owns that she'd heard of Pergolesi and Handel.) I think performers should take into account what their audiences are familiar with and want to hear.
What I didn't say: So you're only happy if you hear some music you know, by composers you know, in styles you're comfortable with?
What I thought: Sometimes I wonder where I came from, but I'm obviously her daughter.