The term 'Pastoral Pipe' refers to a type of musical instrument, specifically a type of bagpipe. The instrument is made up of a REED, which is a thin strip of material that vibrates when air is blown through it, and a bag, which is filled with air and connected to the REED. The REED is usually made of cane or bamboo, and the bag is usually made of leather or cloth. The instrument is used in traditional folk music, and is often associated with pastoral scenes.