Bass
The bass is sometimes called the "Double Bass," "Upright Bass," "Bass Violin", "Contrabass," or "String Bass" —they're all the same instrument.
The bass looks a lot like a violin but it's much larger and has a deeper sound.
Its very low tone creates the foundation for orchestral music.
The bass is used in lots of music
styles like classical, jazz, rock, country, rockabilly, bluegrass, folk,
and many others.
While a lot of music for bass is written for a whole orchestra, there is also much for smaller groups and even some bass solos.

The player is called a bassist and usually sits on a high stool or stands when playing.
The bass can be played with a bow or plucked with the fingers, depending on the sound wanted.
Both boys and girls play bass. They simply have to be big enough to reach playing position and the stretch of the notes.
Although the bass is large, it's not louder than other stringed instruments. The notes are just lower.
Bass is not a difficult instrument to play—anyone who is willing to practice can be a good bass player.
Here's an example of bass playing with an orchestra. (For other examples of bass playing in different styles click on "Bass Performances" on the left menu.)