Of course, the weak link, from my perspective, still being speakers, which do not vibrate in the same way as instruments...I am reminded of a fascinating visit I had about two weeks ago with a research scientist on our faculty. He has worked for 40 years with microbial cellulose. One application we discussed was the use of the material for audio playback. He has already been working with Sony. They have developed a pair of headphones...cost, about $2,500. I thought of a cellulose wall of sound, not unlike the idea of a large electrostatic speaker system, with the difference being that the cellulose would not break up like mylar when it came to handling the bass frequencies...and continuing the day dreaming...having recordings where each instrument would have its own microphone and the reproduction characteristics of the various part of the cellulose being adjusted to replicate the manner of the original vibrating medium...eg, string and sound board of a violin. But then, why go to the trouble when most people are happy with an MP3.