He always demanded of himself (and his students) that musical proficiency, intelligence, and emotion be in balance, regardless of the particular style. Oistrakh felt that a violinist's essence was communicated through clever and subtle use of the bow, and not through overly expressive use of vibrato. To this end he developed a remarkably relaxed, flexible right arm technique, capable of producing the most delicate expressive nuances, but equally capable of generating great volume and projection. (Blair Johnston, allmusic.com)