The double bass is the largest instrument in the orchestra. The strings are so long and big that it is played standing up or sitting on a tall stool. These long strings produce a very deep dark sound which makes the orchestra sound very full and rich.
Check out the videos below to hear some examples of the bass!
Coldplay - Viva la Vida
L'Elephant
The Pink Panther Theme
Philharmonia Orchestra: Introducing the Double Bass