Blowing on a horn, also known as tooting, is an action that has been used for centuries to communicate messages over long distances. It is often used in military and hunting contexts, but can also be used to signal the start of a race or to announce the arrival of a special guest. Tooting is also used in some musical performances, such as jazz and classical music. The term 'blow on a horn' is often used to refer to the act of tooting.