Brass instruments are a type of musical instrument that produce sound when air is blown through them. Bugles, tubas, trombones, althorns, and HORNS are all examples of brass instruments. Bugles are six-letter instruments that produce a loud, high-pitched sound. Tubas are five-letter instruments that produce a low-pitched sound. Trombones are nine-letter instruments that have a slide that can be used to change the pitch of the sound. Althorns are eight-letter instruments that are similar to trumpets but have a mellower sound. HORNS are five-letter instruments that produce a mellow sound.