[Fish hears the music from outside the cavern, along with the sound of someone humming. Naturally, as a bard, they're drawn to the sound. When the elf girl turns to look for someone to talk to, she'll see them-- a fish-like humanoid with violet skin, red hair and fins, very tall, and also very androgynous.

She might even notice the lyre, dagger, and rapier at their hip.]

Well, seems like I'm not the only one around here who can carry a tune. You caught the melody quite well. I don't know what kind of world you're from, but if it's anywhere like mine, that music doesn't... sound like it could be made from any normal instruments.