Oh wow, thanks for sharing these! I haven't listened to Jari's demo stuff even though I'm a huge Wintersun fan. This sounds amazing as everything else he ever recorded.
Indeed, metal is so unique when it comes to this. Fans can feel the emotion without fancy production, and that's all that matters.
Have you heard ENSIFERUM early demos? There are some songs with Jari there that are not on the albums...
I haven't! But I am having their first two albums on repeat for the last two years now. I'll have to catch up.