The size of a jazz band is closely related to the style of jazz they play as well as the type of venues in which they play.
Smaller jazz bands, also known as combos, are common in night clubs and other small venues and will be made up of three to seven musicians; whereas big bands are found in dance halls and other larger venues.
Jazz bands can vary in size from a big band, to a smaller trio or quartet.
Some bands use vocalists, while others are purely instrumental groups.
Jazz bands and their composition have changed many times throughout the years, just as the music itself changes with personal interpretation and improvisation of its performers.
It is common for musicians in a combo to perform their music from memory.
The improvisational nature of these performances make every show unique.
The rhythm section consists of the percussion, double bass or bass guitar, and usually at least one instrument capable of playing chords, such as a piano, guitar, Hammond organ or vibraphone; most will usually have more than one of these.
The standard rhythm section is piano, bass, and drums.
Main article: Rhythm section § Jazz
Main article: Banjo
The banjo has been used in jazz since the earliest jazz bands.
Over time, the four-stringed tenor banjo became the most common banjo used in jazz.
The drum-like sound box on the banjo made it louder than the acoustic guitars that were common with early jazz bands, and banjos were popular for recording.
Main article: Jazz bass
Beginning in the early 1950s, some jazz bass players began to use the electric bass guitar in place of the double bass.
Main article: Jazz drumming
Stylistically, this aspect of performance was shaped by its starting place, New Orleans, as well as numerous other regions of the world, including other parts of the United States, the Caribbean, and Africa.
Jazz required a method of playing percussion different from traditional European styles, one that was easily adaptable to the different rhythms of the new genre, fostering the creation of jazz drumming's hybrid technique.
Main article: Clarinet § Jazz
The clarinet is a woodwind instrument with a single-reed mouthpiece.
A clarinet player is known as a clarinetist.
Originally, the clarinet was a central instrument in jazz, beginning with the New Orleans players in the 1910s.
It remained a signature instrument of jazz through much of the big band era into the 1940s.
The B♭ soprano clarinet was the most common instrument, but a few early jazz musicians such as Alcide Nunez preferred the C soprano clarinet, and many New Orleans jazz brass bands have used an E♭ soprano clarinet.
With the decline of the big bands' popularity in the late 1940s, the clarinet faded from its prominent position in jazz and the saxophone rose in importance in many jazz bands, probably because it uses a less complicated fingering system.
But the clarinet did not entirely disappear.
In the late 50s, traditional jazz experienced a revival, with the notable example of clarinetist Acker Bilk's Bristol Paramount Jazz Band.
Some of the works of Bilk's jazz band reached the pop charts.
Main article: String section
Main article: Jazz violin
Although the violin has been used in jazz recordings since the first decades of the 20th century, it is more commonly associated with folk music than jazz.
Main article: Vocal jazz
In their book Essential Jazz, Henry Martin and Keith Waters identify five main characteristics that identify jazz singing, three of which are: "Loose phrasing [...], use of blue notes [...], [and] free melodic embellishment."
Often the human voice can act in place of a brass section in playing melodies, both written and improvised.
The deliberate choice of scat syllables is also a key element in vocal jazz improvisation.
Bands playing in this fashion fall under the category of jam bands.
A common way to incorporate improvisation is to feature solo performances from band members made up on the spot, allowing them to showcase their skill.
Credits to the contents of this page go to the authors of the corresponding Wikipedia page: en.wikipedia.org/wiki/Jazz band.