The fact that it wasn't quite human, but was still beautiful, put me in mind of the Sirens, particularly during the line "covered by the salty sea".
Thanks!
While there are things are are clearly not "human" about her singing, Avanna is my favorite Vocaloid. They've managed to keep something in the voice provider's performance that carried through, and it's very cool. I hope they continue to make progress with more realistic voices.