Now that I've been better, I've also had the chance to think a bit about it (thinking clearly was impossible when I had my heavy concussion). As you might already know, I love languages and the sounds of the lyrics carry me away to a bygone era, wondering about how our modern languages might have formed out of this medieval language. The language used in 'Miri it is' namely reminds me of the oldest known poem in dutch 'Hebban Olla Vogala':
The first YouTube-link below contains lyrics, that way, you might be able to see why it made me wonder and it might get you to wonder too.
While I sadly enough could not find the amazingly beautiful version by Zefiro Torna on YouTube, I will add a few YouTube links of 'Miri it is' anyway so you can get a bit of a foretaste of what it sounds like. Nonetheless, to me, the Zefiro Torna version is infinitely better still. If you come across it anywhere and you, like me, like this kind of music too, I really recommend you to give it a listen to! I do not like all of them as much, but since you might have a different taste than I, I've added quite a few versions as they are all vastly different in my opinion.
Enjoy!
Love,
L.