Lost Melodies

Her family moves into a shack so she could have a 'change of scenery', or whatever her parents called it. What's the big deal? There's nothing wrong with her! Well, except for the voices. And possibly the clouds that look suspiciously like people.
In the new house there's one of these clouds in particular that seems to have taken a liking to her. It turns out to be a girl with a long lost melody, who's been waiting centuries to unleash her soul in the form of a song.