I seem to be always recommending this documentary to people, so I may as well put it here. This short (30 minute) piece traces “line singing,” a style of sacred music somewhere between shape note singing and chant. It came from Scotland to the American South, and is now only practiced by some very small, rural groups of Primitive Baptists and similar denominations - including in Gaelic and Native American languages. If you have any interest in sacred music, you gotta give this a listen.

A Conjoining of Ancient Song from Yale ISM on Vimeo.