One of my siblings ran this by me, found it (finally) decades after hearing it on a CD some time in the last century. There are a variety of versions of "Let Your Hammer Ring" out there but this was the specific one the sibling remembered.
If you listen along and you don't have any training for this kind of thing you won't realize that the microtonally shift up a half step (minor second) across the roughly seven-minute story embedded in the work song. Ending on a different pitch than you started on is one of the things that you don't tend to hear about from people who perform, study and teach instrumental music but in vocal music it's fairly normal. It takes a ton of training both physical training and ear training to not modulate to a key that's different from where you started if you're getting into the music you're performing. Sometimes you slide up and other times you slide down. It's notorious in choral performance to overshoot descents and ascents.
