Listen to The Planets, Op.32 : VII. Neptune, the Mystic online. The Planets, Op.32 : VII. Neptune, the Mystic is an English language song and is sung by Gustav Holst and The London Symphony Orchestra. The Planets, Op.32 : VII. Neptune, the Mystic, from the album Holst Conducts the Planets : Seven Pieces for Large Orchestra, was released in the year 2016. The duration of the song is 5:32. Download English songs online from JioSaavn.