I started to say 'Piano' because of the dynamic range and impact of a Grand Piano. Tough to set up a system that can do this, even if you've found a recording where the engineer had succeeded. But on reflection it has to be classical orchestral music where you have a much more apparent dynamic range and integration with a symphony hall as well as appropriate sound from different points in the hall. Too much to expect anything that is really live like. With a piano you can come a bit closer I think. One of the killers in orchestral recordings is the practice of spot lighting strings for example. Often bright to the extreme on a recording but rarely so in a live event. But its all good anyway.
