This document discusses three types of aerophones: the bugle, didgeridoo, and shofar. It provides details on the history and use of each instrument. The bugle was developed in the 18th century and used for military calls. The didgeridoo is a wooden trumpet from Australia that is sometimes played with clapsticks. Ancient Israel used the shofar, a ram's horn, for battle, ceremonies and celebrations. All three instruments produce sound by causing air to vibrate without strings or membranes.