"Vibrato is next thing you need to know about, Kelski. Vibrato is a technique of the left hand and arm in which the pitch of a note varies in a pulsating rhythm. It is achieved by fingertip movements which alter the length of the vibrating string. There are different styles of the vibrato, ranging from the use of just the fingers, to the use of the wrist or even the whole forearm." Mosa said, finally taking a breath. "The speed and amplitude of vibrato oscillations can be varied for musical effect by using different techniques." Then the old woman picked up her violin and demonstrated, showing Kelski what was needed to achieve the Vibrato.
"Violinists oscillate backwards, or lower in pitch from the actual note when using vibrato. Aural perception usually favors the highest pitch in a varying sound. Vibrato does little if anything to disguise an out-of-tune note." Mosa paused again, her sharp eye trained on Kelski once more. "Vibratos are hard to master and have taken many violinists I knew eras to master, so don't feel bad if you don't get it right away."
Kelski tried. It wasn’t nearly the same effect as the old woman achieved, but she still managed a bit of it, getting the idea of what Mosa was trying to convey to her.
"Now, in regards to a violin string, the ends of the string are nodes. By changing the position of one of these nodes through tension and length at the bridge, the violinist changes the effective length of the vibrating string and thereby the note played. So, by lightly touching a string with your fingertips at a node while bowing close to the bridge, harmonics can be created. These replace the normal solid overtone sounds of higher pitches bowing normally produces. There's a real formula that goes into this. Exactly half way along the length of the string will produce an octave higher in pitch. A third of the way along the string can produce an octave and a fifth higher. This is the way we get multiple tones in a song. A really good instrument will provide all sorts of these harmonic variables, which new violinists need to be aware of.” Mosa said.
Truthfully, Kelski was starting to feel a bit overwhelmed. But she dragged in a deep breath, hung on, and reminded herself of how hard jewelcrafting seemed when Master Li was just getting started teaching her. This couldn’t be any worse… this had to be easier. Music was instant gratification. She put effort in and sound was produced. That was far better than learning theory after theory with no way to actually participate in the skill.
“But I don’t want to get you involved in reading and writing music just yet, Kelski. That’s a lot to bite off until you get more comfortable with the violin. Then I can teach you basic music theory and a bit about reading notes.” The old woman injected, cutting herself off from a tangent before she got one started. Harmonics. Mosa was teaching harmonics.
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