What hymn / song is this?
In the video, it is described as "the one about the fellow with the harp".
I searched for a long time already but without title/lyrics it is impossible.
Some words may be: "sing pray ... though I fault" "praying to his angel voice" or "praying to his ancient voice"
You can hear it in this YouTube Video: https://youtu.be/65_DFbzQah0?list=PL4809AF1CA7DC7D9D&t=330
It is a scene from Sense and Sensibility (1971 tv series) https://www.imdb.com/title/tt0254768/
Maybe someone heard it elsewhere.