Tuba — the largest brass instrument

Construction and characteristics

A typical orchestral tuba consists of many feet of coiled tubing (a full-length instrument often uses roughly 16 feet of tubing when unwound), a large cup-shaped mouthpiece and a set of valves. Tubas are made in several pitches, most commonly BBb, CC, Eb and F, and may have three to six valves. Valves may be piston or rotary types; additional valves or a compensating valve system help correct intonation in the lowest notes by redirecting airflow through additional tubing.

History and development

The modern tuba emerged in the early to mid-19th century as makers sought a more reliable low brass voice to replace older instruments such as the ophicleide. By the middle decades of that century the tuba had been adopted into military bands and gradually into the symphony orchestra, where it expanded the available palette of low colors and reinforced the bass line alongside string and woodwind basses. Its development paralleled improvements in valve design and brass manufacture.

Types and common variants

• BBb and CC tubas: common in orchestras and solo repertoire; CC is frequent in the United States for orchestral work.
• F and Eb tubas: smaller and lighter, often used for higher orchestral or solo passages.
• Sousaphone: a wrap-around marching tuba designed for comfortable carrying in parades and field use.
• Euphonium: a related, smaller instrument pitched higher than a tuba and often used in concert bands.

Playing technique and musical role

Tuba players produce sound by buzzing the lips against a large mouthpiece and shaping airflow and embouchure to control pitch and timbre. The instrument requires substantial breath support and air control, particularly for sustained low notes, but also responds to subtle changes for legato phrasing and pianissimo playing. In ensembles the tuba frequently doubles bass lines, provides harmonic foundation, and in some repertoire carries melodic or solo passages.

Uses, repertoire and notable facts

Tubas are standard in symphony orchestras, concert and military bands, brass quintets and chamber groups, as well as in some jazz and film score contexts. Solo repertoire and concertos for tuba exist, and modern composers have explored its expressive capabilities. The instrument is notable for its combination of great acoustic power and surprising agility; while it can be among the loudest orchestral instruments, it can also blend smoothly with other low voices.

For more about its classification in the larger group of brass instruments see brass family, and for historical context on its 19th-century adoption consult sources on the instrument's emergence in the 19th century.