What is the myth of Lyra?

Could you please elaborate on the concept of the "myth of Lyra"? Is it a tale rooted in ancient mythology, perhaps associated with the constellation of the same name? Or is it a modern fable that carries a specific metaphor or lesson? I'm intrigued to know if it speaks to the idea of guidance, as Lyra is often associated with navigation, or if it touches upon themes of love, adventure, or something else entirely. Enlighten me on the CORE narrative and any cultural significance the myth of Lyra might hold.