The Different Parts Of A Cornet: The Anatomy And Structure Explained

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Written by David Walker
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To the average person, a cornet might look like a trumpet. However, to brass players everywhere, the difference is noticeable

If you’re learning the cornet, trumpet, or any brass instrument for that matter, it’s essential to know the ins and outs of this instrument’s unique construction. 

In this article, we’ll go through the different parts of a cornet, along with their purposes and how each one influences the instrument’s unique sound. By the end, you’ll be able to pick out a cornet from a trumpet in your local marching band with just a glance. 

Anatomy of a Cornet

Here is a quick overview of all the parts of a cornet you need to know:

  • Mouthpiece
  • Mouthpiece Receiver
  • Valves
  • Valve Slides
  • Tuning Slide
  • Water Keys
  • Bell

There are a couple of smaller parts as well, but we’ll go through those in detail below.

Keep reading if you want to know more about how each of these parts interacts with one another. 


A cornet’s mouthpiece is no different from similar brass instruments.

It’s a small, funnel-shaped piece of metal that receives the air from the player to create sound. 

You put your lips to the mouthpiece, buzzing them and creating a seal on the metal.

The air travels into the mouthpiece and through the intricate pipe system until it comes out the bell. 

Most mouthpieces are made from metal, typically leaded brass plated with gold or silver.

However, children’s cornets might have plastic mouthpieces that make them easier to play.

Mouthpiece Receiver

The mouthpiece receiver is a small cylindrical metal piece that attaches the mouthpiece to the leadpipe.

It’s typically made from a similar brass material as the mouthpiece but might be plated with a different material to signify separation.

You need to insert the mouthpiece into the mouthpiece receiver without applying too much pressure.

Otherwise, both parts may become stuck in a way that can damage the instrument and muffle any sound coming out of the bell.


The leadpipe is the straight piece of metal tubing attached that connects the mouthpiece to the tuning slide.

It’s also made of a plated brass material and is the first in a complex series of tubes that lead to the bell. 

Finger Hook

Further down the lead pipe is the finger hook, a curved metal piece that the player uses to comfortably hold the cornet in one hand.

While playing with two hands, you might still utilize the finger hook to get a good grip on the instrument.


Cornets, like the trumpet, have three valves that serve as the primary means for the player to change the instrument’s tone.

They lead away from the player, the first being closest to the mouthpiece, second in the middle, and third at the front end towards the bell. 

Each valve is composed of a valve casing and valve piston, redirecting air to the various slides around the instrument.

A combination of finger movements that change air direction and outward air pressure allows the player to change tone and volume. 

Valve Casing

The valve casings are ring-shaped metal pieces that protect the pistons and keep them in place.

Without them, the pistons would bend or break every time you tried to push them down to create a specific tone. 

Inside each casing is a small rubber seal that plugs the gap between the pistons, allowing the player to manipulate air pressure more effectively.

This creates an airtight seal that helps maintain air pressure inside the instrument. 

Valve Piston

The small, metal pieces with flat tops coming out of the valve casings are the cornet’s pistons.

These are the parts of the valves that the player manipulates to create different tones. 

When you see a cornet player play, you’ll notice their fingers moving in a flurry at the top of an instrument.

This is where the pistons are, and they’re the central part used to manipulate the cornet’s sound. 

Pistons have to be cleaned and checked regularly.

Otherwise, they might get jammed as you play, bungling your intended notes in the process. 

Valve Slide

Cornets have three valve slides that receive the redirected air from the pistons.

There’s one valve slide near the player’s mouth, one on the instrument’s right near the tuning slide, and one at the far end next to the bell. 

Players slide each valve to make minor adjustments to the pitch of the sound coming out of the bell.

This has to be done with great skill, coordinating finger movements on the pistons with correct timing on each respective slide. 

Tuning Slide

The tuning slide is another one of the cornet’s sliding pieces, but it serves a different purpose than the valve slides.

There’s only one tuning slide, and instead of adjusting pitch, it helps manage tone. 

It’s also the largest slide on the cornet.

While the valve slides are fairly small, the tuning slide takes up most of the cornet’s length, ending just before the third valve slide on the opposing side. 

Water Keys

As the player breathes into the cornet, the airflow changes the pressure and temperature inside the instrument.

As a result, water builds up inside the brass pipes, muffling the sound and leading to corrosion over time. 

The cornet has two water keys that the player opens to let out the moisture to prevent this from happening.

The first is on the tuning slide, and the second is on the third valve slide, both at the very front of the instrument.

Simply release each latch when you start to feel some water kicking around or between songs to prevent it from happening entirely. 


The bell is the front-facing part of the cornet that projects the instrument’s sound.

It gets its name from its shape, similar to a bell, except the ends slightly flare outward.

While it’s the most recognizable, the bell is arguably the most important as well.

Without it, even the most skilled player can’t push out a tune.

Bells, like the rest of a cornet, are typically made from brass.

However, unlike other cornet parts, players can swap their cornet’s bell out for another type of material or mod it with additional parts.

Even slightly altering the bell’s shape can have a noticeable effect. 

The cornet is one of the more versatile brass instruments because of the bell’s modability.

Players can alter the sound to match the genre, tone, and playstyle they’re aiming for.

You’ll find cornet players with all sorts of bells in a wide variety of different settings. 

Wrapping Up Parts of a Cornet

And that’s it from us on the different parts of a cornet!

New cornet players need to learn each part’s role in shaping the cornet’s unique sound.

Otherwise, when something goes wrong with your instrument, you might not know how to fix it!

If you want to learn more about the cornet, check out our list of the most famous cornet players for some new inspiration!

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David is primarily a trumpet teacher and performer based in PA, USA. He's been playing for over 40 years and in that time has taught over one thousand students to play the trumpet.