I've gone over situations like this before in various posts and especially in my book How To Make Your Band Sound Great, and it always comes back to professionalism.
1) The guitar player may or may not have deserved it, but take any argument off the stage. Regardless where you're at in the entertainment food chain and how outraged you are over the performance (or lack thereof), iron out your dirty laundry somewhere else.
2) This wouldn't have happened if the band rehearsed more and determined the song wasn't ready, or made sure that the guitarist could play something that made them all look good.
3) This wouldn't have happened if the band hired the right guy in the first place. Too many musicians settle for players who don't fit the direction or musicality of the band.
Playing music is more than just playing music. It's about entertainment, and unprofessional behavior is not entertainment. How do you learn professionalism? Having a mentor is the best way, but if one isn't available, you can learn a lot just by looking at any act that's making a living from music. They don't get to that point by shoddy performances onstage in any way. Remember, how you act is how you're perceived.
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