I gotta give the props to the people who wrote the music for this series. I believe it was done by the same couple who did the music on the Wandavision series, which also had fantastic music.
Not only is the Witches Road ballad very memorable, but they even created different versions of the same song, which appeared all thru the episodes. It was awesome.
That little end credits music which played in the finale, with the stringed instruments giving it a proper medieval "witchy" mood was so nicely done. And the end credits music itself was yet a stringed instrument version of the Witches Road ballad.
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Of course, speaking of the Witches Road Ballad, there is yet another open question which I am sure we will never get an answer to.
How did Lorna Wu ever get to learn about it and its lyrics? The season finale obviously drove the point that Agatha herself created that ballad out of thin air. And yet every witch who ever got to hear that song wound up getting eliminated by Agatha.
So how did Lorna know about it, even to the point of recording it, making it a pop song with a cult following, when it was all written by Agatha just to lure unsuspecting witches to their demise?
There has got to be an interesting story behind how Lorna got to hear of it.... and survive.
We will never know for sure, it seems.