👉 Whistlers are musical instruments that produce a distinctive sound by vibrating, usually at high frequency. They are commonly used in various genres of music, including jazz, country, blues, and rock. Whistling can be a simple or complex melody, depending on how it is played. Whistlers are often associated with the sounds of the American West during the 19th century, particularly as they were used by cowboys to entertain their audiences at saloons and rodeo events.