stage, where the main horn points at the audience. In the late 19th and early 20th centuries before electronic sound amplification became common, Stroh violins were used particularly in the recording studio. These violins with directional horns better suited the demands of the early recording industry's technology than the traditional violin. Stroh was not the only person who made instruments of this class. Over twenty different inventions appear in the Patent books up to 1949. Often mistaken for Stroh and interchangeably known as being Stroh-viols, phono-fiddles, horn-violins or trumpet-violins, these other instruments have slipped into comparative obscurity. The history of the electric violin spans the entire 20th century. The success of electrical amplification, recording and playback devices brought an end to the use of the Stroh violin in broadcast and recording. Acoustic-electric violins have a hollow body with soundholes, and may be played with or without amplification. Solid-body electric violins produce very little sound on their own, and require the use of an electronic sound reinforcement system, which usually includes equalization and may also apply sonic effects. Electric violins may have four strings, or as many as seven strings. Since the strength of materials imposes limits on the upper string, it is usually tuned to E5, with additional strings tuned in fifths below the usual G3 of a typical four-string violin. The five-string electric violin shown in the gallery below was built by John Jordan in the early 21st century, and is tuned C G D A E. See also Luthier Ravanahatha Sources Boyden, David The History of Violin Playing from its origins to 1761. Oxford University Press, Oxford, 1965. . Further reading Schoenbaum, David, The Violin: A Social History of the World's Most Versatile Instrument, New York, New York : W.W. Norton & Company, December 2012. References Violin Violins