These might or might not be relevant, depending on what sort of harmonies the thread-maker had in mind: 19th-century Welsh Hymns 19th-century Russian Hymns 19th-century American Shape-note Hymns (examples( Medieval polyphony (example)
19th-century Welsh Hymns 19th-century Russian Hymns 19th-century American Shape-note Hymns (examples( Medieval polyphony (example)