I'd go along with almost everything in the first 2 posts. I often use all caps for titles, as do a lot of printed texts. Most of my song books (UK & US) capitalise the first letter of each line and I've always followed this practice.

I do use some punctuation - mainly full stops within verses, but sometimes commas, particularly when there are lists. When copying from a printed text, I always follow the source, even when I think it's wrong. If it's very wrong, I add a note to pass on the blame.

I find spaces before punctuation so distracting that I sometimes give up reading.

You'll see from this post that I was educated at a time when correct use of commas was standard, and I can't break myself of the habit.

Phil