Invention of the telephone
The carbon microphone was independently developed around 1878 by David Edward Hughes in England and Emile Berliner and Thomas Edison in the US. Although Edison was awarded the first patent in mid-1877, Hughes had demonstrated his working device in front of many witnesses some years earlier, and most historians credit him with its invention.
Mass communication
Recordings, developed in the 1870s, became the first non-print form of mass communication.  The invention of the phonograph by Thomas Edison in the late 19th century, the graphophone by Alexander Graham Bell and Charles Tainter, and the gramophone by The Victor Talking Machine Company were the first competing mass media forms that brought recorded music to the masses. Recording changed again in the 1950’s with the invention of the LP (long play) vinyl record, then eight track-tapes, followed by vinyl, and cassettes in 1965. Compact discs (CDs) followed and were seen as the biggest invention in recorded arts since Edison.