Back in the 70's, I was introduced to "Sacred Harp" singing by the accapella group Threadbare Consort. After a bit of research, found an address in the US. Sent off a gentle enquiry, two weeks later, a parcel arrived. The complete Denson revision. Beautifully bound. (Must have cost a fortune!) The note with it thanked me for my interest, and suggested I made a contribution to my favourite charity...(which I duly did!)
3 or 4 hundred Sacred Harp hymns...Just amazing. What nice people!
My band at the time recorded a couple of them before we split up. I've still got the book though...