String Instruments consist of:
Violin
Viola (violin on left, viola on right)
Cello
Double Bass (this is the main situation you will come across a double bass - pizzicato bass line)
The ensembles they can be found in are an orchestra or a string quartet.
A string quartet consists of 2 violins, a viola and a cello (no double bass).
Playing techniques: Pizzicato (plucked), Arco (with a bow), tremelo.
Now look at this video - all the playing techniques in a string quartet. Can you recorgnise the sound of each instrument?