Alternatively, the story could be a satirical take, but that might not be what's needed here. Maybe best to have the protagonist be a fan named Katy. Wait, the user might be looking for a story where Katy Perry the artist is downloading her own song for her birthday. Let me consider that possibility. Maybe she wants to create a personalized playlist for her birthday party, but she's a star and wants to ensure the best quality for her home listening. But why would she need to download an MP3? She already produced the song. Maybe she wants a remix or a specific version.