[Listening extract, audio available. See printed QP for questions.] A brass ensemble performs a fanfare. (a) Describe how brass instruments produce their so...

(a) Buzzing lips into a cup-shaped mouthpiece [1]

Brass instruments produce sound through lip vibration (also called "buzzing"). The player presses their lips into a cup-shaped (or funnel-shaped) mouthpiece and blows air through them, causing the lips to vibrate. These vibrations are amplified and shaped by the instrument's tubing. This method of sound production is what defines an instrument as a member of the brass family, regardless of the material it is made from. The lip buzz creates a standing wave inside the tube, and the length and shape of that tube determine the instrument's fundamental pitch and tonal character.

(b) By changing lip tension / embouchure [1]

A brass player changes pitch without using valves or a slide by adjusting their embouchure - the tension, shape, and position of the lips against the mouthpiece. Tightening the lips and increasing air speed produces higher pitches (higher harmonics of the instrument's natural series), while relaxing the lips and reducing air speed produces lower pitches. This allows the player to access different notes within the harmonic series - the natural overtones that any tube of a given length can produce. Valves and slides change the effective length of the tubing to access additional notes between the harmonics.

(c) Mute [1]

A mute is a device placed inside the bell (the flared opening) of a brass instrument to alter its tone colour (timbre). Mutes reduce the volume and change the quality of the sound, often making it thinner, more nasal, or more distant. There are many types of mute, each producing a different effect: a straight mute gives a bright, edgy tone; a cup mute produces a softer, more muffled sound; a harmon mute (wah-wah mute) creates a thin, buzzy quality often associated with jazz trumpet. The Italian instruction con sordino tells the player to use a mute, while senza sordino means to remove it.