Harmonics can be divided
into natural and artificial harmonics. For the purpose
of intonation it may be useful to practice the artificial
kind. The harmonic will not sound if the note is even
slightly out of tune.?? Famous violinist such as Zino
Francescatti found scales in harmonics one of the most
essential exercises and this shows in his performance.
Another significant part of a violinist's
daily practice should be double stops. Double stop exercises
can train the hand shape to anticipate the intervalic
space between notes and can help to build up good left
hand habits. Although very difficult, one can improve
the hand by combining both harmonics and double stops.