What is sound-on-disc?

Sound-on-disc refers to a method of recording sound onto a flat disc, which can then be played back by a turntable. This was one of the earliest methods of sound recording and was used in the late 19th and early 20th century. The process involved using a master disc, which was used to create a series of grooves representing the sound waves. The resulting disc could then be stamped or replicated for mass production. Sound-on-disc was eventually replaced by other methods of sound recording, such as tape and digital recording, but it remains an important historical artifact in the development of audio technology. Today, sound-on-disc recordings are mainly used for archival purposes and for collectors of antique audio equipment.