"Let All Mortal Flesh Keep Silence" is one of my favorite songs during Advent. (Our church choir sings this beautifully. I would put it on my blog if I had a recording of it.) On YouTube, I listened to quite a few recordings but so many of them were so...polished and somehow just seemed like professionals doing a job rather than singing a hymn. I found a woman singing this as she was accompanied by her husband on guitar. I love this recording...you can hear children in the background, every so often you can hear someone whispering, and the recording itself isn't perfect but please stay with it and see if you are not moved by the genuine feelings that come across. You might want to just listen, but watch it too as her hands are very expressive as she sings.
Wishing you all a peaceful Advent.