Double bass
Terminology

A person who plays this instrument is called a "bassist", "double bassist", "double bass player", "contrabassist", "contrabass player" or "bass player". The names contrabass and double bass refer (respectively) to the instrument's range, and to its use one octave lower than the cello (i.e. the cello part was the main bass line, and the "double bass" originally played a copy of the cello part; only later was it given an independent part). The terms for the instrument among classical performers are contrabass (which comes from the instrument's Italian name, contrabbasso), string bass (to distinguish it from brass bass instruments in a concert band, such as tubas), or simply bass.

In jazz, blues, rockabilly and other genres outside of classical music, this instrument is commonly called the upright bass, standup bass or acoustic bass to distinguish it from the (usually electric) bass guitar. In folk and bluegrass music, the instrument is also referred to as a "bass fiddle" or "bass violin" (or more rarely as "doghouse bass" or "bull fiddle"). As a member of the violin-family of instruments, the construction of the upright bass is quite different from that of the acoustic bass guitar, as the latter is a derivative of the electric bass guitar, and usually built like a larger and sturdier variant of an acoustic guitar.

The double bass is sometimes confusingly called the violone, bass violin or bass viol.
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