As far as a live concert in a large hall. I think it could be argued that the live concert is not actually "live" ..... huh. Guitars, drums, vocals, keyboards, all hooked up to mics and speakers. Even in a live concert you are listening to 100% speakers in a lot of cases. 100% speakers playing in a massive room. If you could record from each mic separately and then sync and playback in that same venue, would it sound essentially the same? (of course in real life the ambient sounds of the reflected hall would also be in the recording but if you could eliminate that, would it sound the same. I think for the most part, yes