udio in 3D? Over the years, there have been many attempts to make this vision presentable. The expansion of the sound spectrum from mono to stereo in the 60s was a first step, in the 70s there were quadraphonic experiments, from the 80s/90s selected albums were also released in surround formats such as 5.1. or 7.1. on DVD and later Blu-ray. However, only a small minority could ever hear these special mixes, as most music fans do not have such a setup at home. Movie lovers with surround home theater systems have an advantage. In general, it seems that surround has become the norm,
