Heres what a buddy of my brothers who did session work in the 70's told me this last monday...he said to keep your mouth shut and play what they want you to play cause you arnt doing your thing you are following their vision. He said to be a good guy, AND that there was another guitarist who was the number one guy there but he was a jerk and complaing and they told him to beat it and told my bros friend hes the new guy.