Shellac: A record made from a brittle wax between the 1890s and 1950s, often for a disc that plays at 78 rpm. Year: 1959 ...

In a monophonic record, an undulating horizontal groove was cut into the vinyl, providing both frequency and amplitude. Stereo, which was a big deal when introduced in the late 1950s, was designed ...

As the first post-war decade, the 1950s launched modern American popular ... the ’50s were such a groundbreaking era for ...