The need for touring concert sound and lighting systems has increased with the demand for concert tickets. Every year there is a bigger tour than the year before, with more equipment and technology, and a larger touring staff. The venues needed to accommodate elaborate productions are usually larger, and so is the audience. Touring sound and lighting systems have developed to provide the equipment necessary for performances in large arenas. At first concert tours used available equipment designed and manufactured for theater use, but as the industry grew, specific products were developed for touring concert systems. Advancements in technology from valves to transistors to silicon chips have been part of the evolution of touring systems. This evolution will continue as performers strive to present shows that surpass previous efforts.