New kinds of musical ``rooms'' can be constructed where different participants are in different places. The last 50 years or so we have had the connection between the home and the radio studio, as the only alternative to the concert hall. Just like some TV- and radio-shows more and more experiment with using live telephone connections to create more of a feeling of presence, these technologies can be used by composers/performers to connect with each other at different physical locations for the purpose of common distributed performances.
The problems of varying bandwidth and long delay time due to the structure of the network and also to simple physical facts such as the constant speed of light can be prohibitive. Lately it has been shown that using fibre optic cables gives better delay times than satellite links for global communication, simply since the distances the waves need to travel are shorter. It seems also to be more cost effective with cables.
Since a truly interactive musical application often demands a maximum end-to-end delay time of a few ms it might be impossible to achieve the goal of a truly world performance room. Theoretically the limit might be approximately a physical area the size of Europe. For distribution purposes, however, this can be overcome by buffering and local synchronisation.