When you learned to play the piano, it was important to develop a level of independence between the left and right hands. When learning to improvise on the piano using three voices, it's important to develop a level of independence between two voices in one hand.
An improvisation consisting of three voices, or three parts, generally contains one voice in the left hand, one voice in the right hand, and one voice that moves freely between the left and right hands. Sometimes the right hand is playing two voices at a time, and sometimes the left hand is playing two voices at a time.
Most of my piano improvisations contain two voices in the right hand and one voice in the left hand, because that's what I've become accustomed to over the years. Occasionally, I'll move one of the voices from the right hand to the left hand if it'll make it easier for me to improvise a particular passage.
Developing an independence between two voices in one hand takes time. The only way to gain proficiency at it is through practice. Sit at the piano and improvise with only one hand (see Right Hand Study). Improvise using only one voice at first, but occasionally inject a second voice then return to one voice. Over time, as you gain proficiency with improvising two voices in one hand, you'll also be building your muscle memory without realizing it. Muscle memory is important when improvising in three voices, because once you reach a higher level of proficiency, you'll gain the ability to shift your attention from one hand to the other more easily without negatively impacting that hand that you're removing focus from.
When practicing improvisations with three voices, just like when practicing with two voices, keep it simple at first. Leave out the counterpoint and remove unnecessary complexity. You can add more complexity later once you build a foundation. Proficiency doesn't take hours or days, it takes years.
In this demonstration video, I set two voices in the right hand. My focus then shifts to adding a third voice using the left hand. The third voice will be simple at first without counterpoint or complexity. As the improvisation progresses, I'll add more complexity and counterpoint to the left hand.
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