[sxisqanh] Is it live or is it Memorex?

Under what conditions is it preferable to consume or experience and event live instead of a sound or video recording?

The biggest difference of "live" is that it is social: you consume simultaneously with others around you.  When does that matter?  How does that matter? 

There are a few other technical differences that are rapidly being eliminated by technology, e.g., VR.