How can you not have multichannel system

I have not had the opportunity to listen to a really good multichannel system/setup with music as the predominant medium. I've heard some pretty darned impressive multichannel systems featuring DVD movie format. Additionally, I only have a two-channel system. This is my disclaimer - since the hostiles are a bit ramped up here.
That being said, I have always been of the impression that two-channel audio, for music, presents the most realistic soundstage, including the best centralized imaging capabilities. I would not be surprised however, if advancements in technology will (or possibly already have) change the proverbial playing field, or at least offer legitimate alternatives. When multichannel gets it right, does it merely provide a realistic “concert hall” experience, or does it also capture the essence of the performance – sans reverb, room acoustics and atmosphere? Just what is mixed into the other channels? The stage is always coming at you from in front of your position. Certainly, a multichannel mix does not include any instruments/vocals coming from anywhere other than the front – right???? So, what is being channeled to the other channels - reverb, crowd noise…what? What am I missing here?
I heard a multichannel Black Crows DVD at the local Best Buy and found it laughable to hear the guitar coming from the rear channel. I’m sure it was a bad mix, and for certain it was….well, it was a Best Buy system. Anyway, in defining the differences between two-channel and multichannel, just what are some of the more significant characteristics/qualities of one format over the other? I mean in addition to the whole horse drawn carriage analogy and Reggie Jackson quote - which is over my head!

Eldarford,

Your point is well taken, and as I stated, I really have not had an opportunity to listen to a really good multichannel music system. The fact that I have only heard really poor multichannel music systems has obviously prejudiced my perception. It's just that the argument - as presented in this thread - is so poorly....well, argued, that I couldn’t resist a bit of sarcasm. I truly would like someone to describe the enhancements / augmentations that well-executed multichannel brings to the music presentation. For me, a well defined explanation, or description paints a much better picture than a “cork-in-the-wazoo” one point perspective. No offense to anyone…really. What’s it like man! Some of us really do want to know.
Thank you…really.

Indeed. Very nice Onhwy61...well said.

Mig007, your thread has garnered 108 responses (and counting) - you “struck a chord!” Well done.