"Lacie" by Pandora Hearts is a hauntingly beautiful piece originally performed in the key of G# major. It is composed and interpreted by the Japanese composer Yuki Kajiura. One interesting fact about this song is that "Lacie" is actually the name of a character from the manga series Pandora Hearts, for which this track serves as the theme song. The melody is delicate and melancholic, with emotional piano arrangements accompanied by subtle orchestral elements, creating a mesmerizing atmosphere.