Composer Gustav Holst loved astrology. He called it his "pet vice" and read a book called "What is a Horoscope and How Is It Cast?" So when he was writing his orchestral suite, "The Planets," he wasn't writing about astronomical bodies in orbit around the sun. He was thinking of the astrological character of the planets like Jupiter, "The Bringer of Jollity." It's amazing what a difference a few letters can make. On today's Performance Today, we'll hear Holst's musical and astrological exploration of space.