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Ugh... did I tell them not to talk to the audience at all?
I mean, what's the point of listening to chatter when it's just in an MP3 song... a regular one... especially every time that song is in your playlist! Why would I want to listen to the same thing every day, and besides, I can't even see them because it's an MP3 track! It's probably easier to just cut it out...
Okay, if I'm watching a concert video, then it's fine to listen... it's even better when you understand what they're talking about... (sorry for the repetition)
Exz, you're either slow or just being a troll... IMHO.
As for performing better than a studio recording... try singing live for over an hour on a huge stage, and if it's one of several performances in a single week? I think that's very tiring, and the person gets very exhausted; it's not easy...
The voice can't always be in perfect condition either. Anything can happen... they might get a little sick, not have enough air to hold a note (that can happen to anyone), depending on the weather, or maybe they're just not as young as they used to be... there are many reasons.
P.S. You can't always do EVERYTHING perfectly!