Nice comeback, ComebackI am going to suggest that the number one skill is listening. This is an active conscious endeavor, the quality of which degrades as we become fatigued. We must listen attentively to other artists as we develop our own sound. We must listen closely to ourselves as we solo. We must listen to our section mates and group as we perform with others to be sure we are doing our part well. Perhaps most importantly, we must resist the temptation to become mechanical and concentrate and listen as we practice so we know we are indeed improving. I am really not sure the other named skills matter so much without this one.