Just caught a minute of a Terry Gross radio interview with jazz musicians whose latest album is based on sacred harp songs. (The saxophone is about the last instrument I would've thought suited to sacred harp, unless maybe Ornette Coleman is playing it, but perhaps this is a failure of imagination on my part.)
Here's the transcript of the interview, audio at the top:
The story in the same show about field recording ancient Christian chants in Aleppo is pretty damn good too.