The viola is a member of the violin family of instruments. It is a few inches longer than the violin and tuned a perfect fifth lower then the violin. The treble clef is used for viola music when played in the higher registers, but the alto clef is the default clef used in viola music. Otherwise, it, and the way that it is played, is virtually identical to the violin. While the viola can be used for in many styles of music, it is used primarily in classical music.