One thing that recorded music can never seem to reproduce is the stuff that happens in the air when you play resonant double-stops on a stringed instrument. A particularly good instrument (or a group of instruments) will excite a whole rainbow of vibrating resonances, that dance around like a group of excited atoms. A good set of speakers and a set of extremely sensitive microphones can come close to capturing what happens on the surface during a given moment, but the beauty of live performance (or live practice) is that each time you play--even the same written notes--the set of phantom rainbow resonances that happens inside of the intervals, inside of the double-stops, is different. The set of dancing rainbow resonances even varies over the duration of a double-stop, even if the double stop only lasts for a very short amount of time.
There is a universe inside of a perfect fifth, particularly because, in addition to all the magical dancing atomic rainbow vibrations, it contains implied possibilities that are sometimes filled in by the imagination of the listener (and player), and are sometimes filled in by the addition of a major or minor third, which throws those atomic rainbow resonances into a whole new hierarchy.