Literally, this is "performance means," which does not mean much to me, at least. Since the sentence speaks of virtuosity, "instrumental technique" appears appropriate.
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Musical technique is the ability of instrumental and vocal musicians to exert optimal control of their instruments or vocal cords in order to produce the precise musical effects they desire. Improving one's technique generally entails practicing exercises that improve one's muscular sensitivity and agility. Technique is independent of musicality.
https://en.wikipedia.org/wiki/Musical_technique