The double bass made its debut in an orchestra in the 18th century. It is the largest of the string instruments.
In its shape and characteristics, it is similar to other string instruments, but it generates tones in the lowest register.
In the low register the double bass sounds full, while in the high register it can be very expressive, warm, melodic, and sometimes aggressive.
The role of the double bass in the orchestra is to confirm the tonality of the composition with the tones in the bass and thus to give the orchestra the tonal foundation for the fine melodic lines.
It is a very expressive instrument in the jazz music.