Music written for String Quartets has four staves. The instrumentation is:
  • 1st Violin
  • 2nd Violin
  • Viola
  • Cello (Violincello)
The two violin parts are written in Treble clefs. The Viola is typically written using the Alto clef while the Cello is scored on a Bass clef.

Notice that the Bar lines run vertcially across the 4 staves, which is common in String Quartet scores.   Tuning and note ranges for each of these bowed string instruments varies and is shown as follows:

The symbol 8va means to play the notes an Octave higher than written whereas 8vb means to play the notes an Octave lower than written.
The following is a quick 4 bar sample of what a String Quartet would look and sound like.