Here in Brazil we have churches that allows members to sing songs from a book that we call it Christian Harp[1] as part of the worship, the result is a lot of people who can't sing to save their own life end up singing and musicians from the church try to find the song key and chords in real time, it ends up being a great practice to develop a good ear.
Thanks for the video link! Very cool. The poor singing combined with the on-the-fly guitar tuning gave the piece a grungy punk-like feel, at least to my ears. I rather enjoyed it.
A cute (translated) comment from the video: “To sing with this guitarist is easy! Just praise the Lord and he does the rest!”
A cute (translated) comment from the video: “To sing with this guitarist is easy! Just praise the Lord and he does the rest!”