HymnChoir.Org is a great resource, archiving foundational Black American gospel expression. The origins of call n response has always been survival, communal, necessity… built out of soul. Whether communicating on plantations, in church, or in prison yards, negro spirituals have always lifted the soul towards freedom.
They have 30 + years of Hymn Choirs singing thru the South East and Mid Atlantic. Check it out below: