Between 1877 and 1925 there was an acoustic era. Acoustics is a branch of science introduced by Joseph Sauveur at the beginning of the 18th century (Chanan 22). The music was created acoustically using pure instruments and raw recordings. In 1925, headphones were introduced, which marked the beginning of the electric age (Taylor 12). By the 1920s, more than 150 companies manufactured records and record players that played records. The records were typically seven inches in diameter and played at a speed of 78 revolutions per minute. Each side of the record contained approximately three minutes of recording, which is equivalent to one song (Miller 35). The first radio broadcasts began in the 1920s (Miller 36). Radio helped promote records and provide free music to listeners. Radio helped the recording industry. In the late 1940s and early 1950s, long-form records (LPs) were released. They were developed by Columbia Records in 1948 and allowed music labels to put more music on a record. It allowed labels to put up to 25 minutes of music on each side of the record (Miller 37). This allowed musicians to be more creative with their music. Later, singles were released, which were 7-inch vinyl records with a large hole in the center and spinning at 45 revolutions per minute (Miller 39). They were good at dishing out hit songs. They could hold up to five minutes of music per side. In 1945, Paul Klipsch introduced the Klipschorn folded horn loudspeaker, shortly after World War II. She contributed to the birth of a “Hi Fi” era. This era was dedicated to the creation of stereo and transistor radios, as well as cassette players (Schoenherr). In 1954, transistor radio was launched. It was patented by Richard C. Koch. The first radio was the TR-1 model and it sold for ...... middle of paper ...... t: Greenwood, 2005. Google Books. Greenwood Press. Internet. May 2, 2014. Riebe, R. Randal. “Get on my cloud.” Systems Contractor News, September 2012: 90. ABI/INFORM completed. Internet. May 1, 2014. .Schoenherr, Steven. “History of Recording Technology.” www.web.archive.org. Steven E. Schoenherr, July 6, 2005. Web. May 2, 2014. Taylor, Timothy D., Mark Katz and Tony Grajeda. Music, Sound, and Technology in America: A Documentary History of Early Phonographs, Cinema, and Radio. Np: Duke UP, 2012. Google Books. Internet. April 29, 2014.Valerdi, Ricardo. “Cloud systems”. Industrial engineer nd: 28. ABI/INFORM completed. Internet. May 1 2014. .