I have recently fallen down a very specific youtube hole: medieval/'medieval' covers of modern songs. There's a whole ecosystem of them! I'm a particular fan of the ones done by Hildegard von Blingin', but there are many very good ones.
You've got some sedate numbers like this cover of 'What is Love?':
You've got some peppy instrumental ones like this medley of meme tunes:
And then you have my absolute favourite, a beautiful melange of (faux?) medieval lyrics and performance with a song that you wouldn't expect to work with that, in the form of Pumped Up Kicks: