Fun fact: the first music that plays when you start the game is called Calliopeia. That was very deliberate on us, I liked the idea of the story beginning (even if stealthily!) with a homage to Calliope. It was our way of asking for inspiration and creativity in this journey, I suppose.
I don't it's an ancient song but, you know, there's some magic there regardless.And thank you for the songs you posted! Even if I do quite a bit on research on them it's always good being pointed out interesting performances. I particularly liked the very delicate performance of the Hymn of Nemesis in the first video you posted.