Call & Response are a part of jazz because jazz was conceived, birthed and incubated in the church before the church abandoned IT, rejected IT and forgot IT.

If improvisation highlights the fact that every person has a unique contribution to the group, call and response is the understanding that every person needs the group.  As the old adage goes, a person becomes person through other people and a Christian becomes a Christian through other Christians. 

I think that this is one reason why Jesus sent out his disciples two-by-two.  Ministry is to be done in community, in response not only to the call of God on our life, but in response to the calls of others around us. 

Can you think of a time that you did something for the kingdom that you wouldn't have done if it were not for someone else calling and you then responding?