D.C. Dounis described several key points about performing the Bach cello suites or solo violin partitas. To understand his ideas let's us look at the following observations...

The wonderful cellist of 30+ years with the Saint Paul Chamber Orchestra, Joshua Koestenbaum reveals a trick he learned from a bio feedback expert while at Yale University...

For years, the vibrato has long been thought of primarily as a means of adding expression to melodic passages.  An “add on.” Teachers have emphasized this point which has resulted in a primary misconception. 

Vibrato is more than a way to add expression to particular notes. 

Vibrato is the basis of left hand technique...

The following interview was published in the book "With The Artists" in 1955. To my knowledge it is the only documented interview with Dounis ever made and probably occurred in the early 1950s in New York City.

These days the assumption warming up prevents injury seems to be a commonly accepted truth.

So why would Dounis, a master teacher, a medical doctor, a man with a reputation for successfully fixing physical problems recommend playing first thing in the morning without warming up?

What are "Displaced Impulses?"

These are impulses that end up in the wrong part of body when a player is struggling with a passage technically and work contrary to the natural movements of the body. A classic example is someone bobbing their head when playing a difficult passage. Of course it can be any part of the body, but always prevents the natural motion needed to play a passage.

The Cure...

Dounis always told his students to always imagine they were playing on a string 1/2 an inch above the real string.

To understand what he meant, do this exercise...

Dounis said that most string players "don't realize that the technique of Up Bow is very different than the Down Bow."

So... What's the difference?

Here's a breakdown...

It is debatable whether knowing about Bach's use of numbers and musical affections teaches us better how to play Bach cello suites, but it can't hurt. Bach is known to have used Numerology and the Doctrine of Affectations as a way to personalize his music and express his devotion to God.