The title of Planetary Prince, which also serves as Graves’ pseudonym, comes from The Urantia Book, a spiritual tome that emerged from Chicago in the first half of the 20th century and that purports to reveal the truth of humanity through a combination of spiritual and cosmological ideas, including radical retellings of stories from the Bible. Graves makes a direct connection between his music and the book with pieces like “Adam & Eve,” “The Lucifer Rebellion,” and the title track. The bold, hard-charging opener, “Satania Our Solar System,” echoes the book’s ominous name for our own neck of the universe.