The moon has always been a personification of the Goddess. The moon has long ruled over traditional farming methods ("farmers' almanacs" are based on the moon's cycles). Harvesting is traditionally done as the moon wanes. Barley is sometimes used to represent love, healing and protection (also attributes of the Goddess). The song is a lovely way to bring together certain ideas, images and beliefs without being preachy or tedious. It honors the Goddess and advocates living in a harmonious way. Cheers!