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Crystal Flavolian
Yeah...it is possible for you to play well and "fake" some feeling...though I don't think that playing an instrument and acting are quite the same thing.
With acting you learn how you are *supposed to feel* during a particular line or scene.
You don't ever get those instructions when learning how to play...there is no script saying "plays angrily" or some such thing.
And I do think that a good audience can sense/see when a player is giving a good "performance" and when he/she is really feeling every note.
We don't necessarily chastise a good "performer"...but I think when a player is "in the zone", there is a certain "vibe" they exude, though it may or may not always be picked up on by all of the audience. Sometimes the "zone" that a player is in is not the same "zone" that a listener ends up in...but it's all good, as long as the music hits home in some way.
As famous beagle says, it's subjective. I disagree on a couple of points - I think that performance is performance whether it be theatrical or musical or a mix of the two (and doesn't all good musical performance have a theatrical dimension?). I also don't think that an audience member has any way of knowing when a player is really "in the zone" if that player is good at giving a convincing performance. That "vibe" you are receiving is really coming from you.
And there's nothing wrong with that. If you paid $200 for a ticket to a concert, don't you want the show to be good irrespective of whether the musicians are in a good mood or not? "Sorry, I'm just not into it tonight" from the guitarist is not going to make you feel better about the money you wasted.