The audio format commonly found for CD's (and older LP's as well) is the classic stereo (two channels: left & right).
For the video, the standards was stereo in the begining (perhaps mono even) and after came the home cinema which create a demand for more channels (usually 5.1). The film industry adapt very quickly to create such new standard and their production made the mixing for supporting that with a good effect.
The question I am wondering is: Is there any CD's (or another support) which are mixed in 5.1 (or more, as there is 7.1, 8.1 and 9.1 amplifiers now)? I mean only music support and not a DVD of a live concert including video.
I heard about SACD, but it looks not very well common. Why is this format not so common and do we need a special player (other than the DVD player on a 5.1 combo)?