Double bass
The double bass is a big stringed instrument. It is also called contrabass and upright bass. It is used in orchestras, jazz bands, rockabilly bands, bluegrass music, and some country music bands. It plays low-pitched musical notes in musical ensembles and bands. In jazz bands, these low-pitched musical lines are called the "bass note." The double bass looks like smaller instruments like the violin, viola, and cello.