During the Rewind Festival we went to a Silent Disco, it was basically a large marquee full of drunk people all wearing headphones, all singing along to one of two channels of music two attendant DJ's were playing out wirelessly to each headphone (which is selectable via a switch on one of the cans). They are lit green for one channel and red for the other, more colours seen means that one of the DJs is playing the catchiest song!
It's quite bizarre really when observing whilst not wearing headphones, no music heard, just dozens and dozens of yelling voices...
Imagine if they had this back in the eighties? Everyone would be weighted down with heavy headphones and tripping over each other's wires!!
