Well it's like this. Get an old dictaphone recorder that runs on batteries, and stock up on your wax cylinders and batteries for it, like James Madison Cappenter did.

Then you go to that field where it's relative quiet, after some local yokel has pointed out the singers in the area that aren't hung up on God's music, and you've enticed them to sing a few ditties that they were ashanmed to admit they knew, but figuring you were a foreigner maybe you wouldn't tell on them.

So the batteries died out while you were recording and the speed control was terrible, so C varied from 256 to 264 Hz. Those disks prove most valuable to the economy. Restoring them to intelligible songs requires the experteze of highly intelligen and highly paid professional electronic engineers (for noise filtering by Fourier transform, to a specturm, filtering the transform to get rid of a lot of the noise, then transforminb back to an audio signal). At this stage you need the experts on resorting original timing so C stays the same instead of wandering all over the place, because of WOW, POPs (Fourier transforming didn't get rid of all of their effects), and Flutter. Getting this all done requires professional fund raisers for noble causes, and they take their cut of the funds they convince someone or some noble cause to commit to restoring our magnficant heritage. You won't get much in the line of a recording, but just look at how much money you got redistributed in the econonmy, and how many people were kept employed by it. What a great achivement!