Clarinet Explained: Features, Types and Tips

How the Clarinet Works

The clarinet is a single-reed woodwind instrument — the player's breath passes over a reed attached to a mouthpiece, causing the reed to vibrate and produce a sound that resonates through the cylindrical bore of the instrument. The bore shape is the defining acoustic characteristic of the clarinet: unlike the oboe or saxophone, which have conical bores, the clarinet's cylindrical bore means the instrument overblows at the twelfth rather than the octave. This produces the distinctive chalumeau register in the lower range and the clarion register above — the two voices that give the instrument its broad expressive range.

Its range extends from the lowest E below the bass clef to above the top of the treble staff in the altissimo register. This gives it one of the widest usable ranges of any wind instrument, spanning more than three and a half octaves in skilled hands.

The Main Parts

A standard Bb instrument is constructed from five sections: the mouthpiece, the barrel, the upper joint, the lower joint and the bell. The keys and tone holes are distributed across the upper and lower joints, allowing the player to cover combinations that produce the full chromatic scale. The Boehm system — the key system used on virtually all modern instruments — was developed by Hyacinthe Klosé and Louis-Auguste Buffet in the 1840s and remains the standard today.

The reed is attached to the mouthpiece by a ligature — a metal or leather clamp — and the player adjusts how much of the reed faces the mouthpiece window, which affects resistance and tone. Reed strength is numbered from 1 (softest) to 5 (hardest); beginners typically start on 2 or 2.5, moving to harder reeds as embouchure strength develops.

Types of Clarinet

The Bb is the most common type, used in concert band, orchestral and chamber settings across all levels. The A clarinet — a semitone lower — is used in orchestral playing to avoid technically demanding keys. The bass clarinet extends the family downward by an octave, with its distinctive upward-curved bell. The Eb clarinet is smaller and a minor third higher, used in certain orchestral and wind ensemble contexts. The contrabass clarinet extends further still but is rare outside specialist ensembles.

Plastic body instruments are standard for beginners — they are durable, tolerant of humidity changes and less expensive than wood. Grenadilla (African blackwood) bodies are standard on professional instruments, producing a richer, darker tone. Hard rubber bodies offer an alternative to wood at mid-range prices.

Maintenance

Regular maintenance is essential for consistent playability. After each session, the bore and mouthpiece should be swabbed to remove moisture — accumulated moisture deteriorates pads and causes key mechanisms to stick. The pads — felt-covered covers that seal the tone holes — wear over time and need occasional replacement. Springs can weaken or break. Annual servicing by a woodwind technician keeps the mechanism in full working order and identifies any developing issues before they affect playability.

Reeds are consumable. A good reed produces a centred, responsive sound; a worn reed buzzes or produces a thin, unfocused tone. Keeping four to six reeds in rotation and discarding worn ones regularly maintains consistent playability. Reed storage — in a purpose-made case rather than loose — extends their working life significantly.

Choosing a Mouthpiece

The mouthpiece has a significant effect on how the instrument plays and sounds. Facing length and tip opening determine the amount of resistance the player feels and how bright or dark the tone is. Most students start on the mouthpiece supplied with the instrument, which is typically adequate but rarely the best option. A step-up mouthpiece — Vandoren's 5RV Lyre or M30 are widely recommended for advancing students — makes a noticeable difference to tone quality and intonation without requiring a new instrument.

Frequently Asked Questions