ok so this needs a bit of explanation. As it was inspired by the fanfic "Background-Pony/Melodious"
“My name is Lyra Heartstrings, and you will not remember me. You won't even remember this conversation. Just like with everypony else I've ever met, everything I do or say will be forgotten. Every letter I've written will appear blank; every piece of evidence I've left behind will end up missing. I'm stuck here in Ponyville because of the same curse that has made me so forgettable. Still, that doesn't stop me from doing the one thing that I love: making music. If my melodies find their way into your heart, then there is still hope for me. If I can't prove that I exist, I can at least prove that my love for each and every one of you exists. Have you ever had a beautiful melody stuck in your head, but you don't know where it came from?
That melody is me."
quotation from the fic, it is REALLY good and has a great "oh shit" moment at the end, if you wish to read it it is here[link]