VIOLIN: The violin is the baby of the string family, and like babies, makes the highest sounds. Treble clef, range from 5g to 9a, also called "Fiddle" when used to play Folk music
VIOLA: The viola is the older sister or brother of the violin. Alto clef, thicker strings and bigger size than violin, therefore sound deeper and mellower than violin, range from 5c to 8e
CELLO: The cello looks like the violin and viola but is much larger (around 4 feet long), and has thicker strings than either the violin or viola. Of all the string instruments, the cello sounds most like a human voice, and it can make a wide variety of tones, from warm low pitches to bright higher notes.
DOUBLE BASS: This is the grandfather of the string family. At over 6 feet long, the double bass is the biggest member of the string family, with the longest strings, which allow it to play very low notes.