Final answer:
A string player uses vibrato by rocking the left hand to produce small pitch fluctuations because they want to create a more expressive and emotional sound.
Step-by-step explanation:
A string player uses vibrato by rocking the left hand to produce small pitch fluctuations because they want to create a more expressive and emotional sound. A string player uses vibrato by rocking the left hand to produce small pitch fluctuations because they want to create a more expressive and emotional sound.
Vibrato adds richness and depth to the sound produced by the instrument, making it more captivating and engaging for the listener. It is a specific musical effect that string players use to enhance their performance and bring out the emotional qualities of the music.