Finger vibrato is vibrato produced on a string instrument by cyclic hand movements. Despite the name, normally the entire hand moves, and sometimes the entire upper arm. It can also refer to vibrato on some woodwind instruments, achieved by lowering one or more fingers over one of the uncovered holes in a trill-like manner. This flattens the note periodically creating the vibrato. Violin and viola There are three types of violin vibrato: finger, arm and wrist vibrato. In finger vibrato, more or less the performer only moves his or her fingers, finger joints. In wrist vibrato, the performer will move the wrist back and forth while keeping the arm in a resting position. In the arm vibrato, the performer opens and closes the arm. Along with using different bodily movements to create vibrato, there are different methods in regards to forward or backward vibrato movements. Vibrato can be achieved by altering the tone of the note being played. Varying the pitch however, is the most crucial aspect in vibrato. This can be achieved by either altering the note to a higher or lower tone. Moving the finger, wrist, or arm forward or backward primarily determines the tone. In common practice, violin vibrato oscillates on and below a pitch, though dramatic effect may allow for oscillation above as well as below a pitch. Throughout the 20th century, finger vibrato was normally used in playing all members of the violin family unless otherwise indicated. Toward the end of the century, playing without vibrato became a more accepted technique in certain contexts. Guitar In its pure form, vibrato is usually achieved by twisting the wrist rapidly to bend the note slightly, moving to and from the starting pitch. The speed of the vibrato oftentimes has a great effect on the way the note is perceived, with faster vibratos commonly adding tension and stress, while slower vibratos produce a more lyrical sound. The slowest of vibratos can be used to imitate a bowed instrument "growing" a note after its initial inception. Even though this effect refers to volume in bowed instruments, having a pitch variation that follows the same structure of the volume variation in many situations can have the same effect for the listeners. In contemporary music, finger vibrato is also routinely used by classical guitarists on longer notes, to create an impression of a longer sustain. The technique is also used by