Call-and-response style, yes, exactly. So whenever different groups get together then there has to be this long period of negotiation. How will we worship? What's acceptable? What's not? If I want to say "Amen" can I?

I spent a lot of time developing in books why worshipping separately actually impacts inequality, economic, social, on and on. So I really do believe there are huge advantages to being together even though it's difficult, even though we have a lot to learn.

We've had people say, "Now when I go to work, I don't feel uncomfortable talking to people of different races, and I go up and introduce myself, and I start making a new friend I wouldn't have done otherwise."

I think with President Obama there's going to be a discussion, because he himself is multiracial, because we have for the first time a non-white president. There's going to be talk about what does this mean? What is it? Are we in a new era?

In part because they had no choice, right? If you were a slave, you did what the master said. And they said to worship: "You're going to worship with us."

There's a lot of terminology, like "washes whiter than snow," and these things which when they're said in a uniracial congregation, they just go fine. But when they're said in a mixed congregation, some people will get offended and wonder, "Why are you saying that? What are you saying?"

Maybe there's even anger. But if they make it through that they come to a new agreement, and they start creating a new culture, and it becomes something that people just - a lot of times they'll say, "I couldn't live without it. I just have to be there."