Not only did cassettes supersede 8-tracks in the car, they also became viable alternatives to vinyl in the home. Then, in the early 1970s, cassettes became capable of good sound quality in a more convenient package.
Eight-track tapes came along in the mid-1960s as a way of playing music on demand in cars. In the late 1940s, 33 rpm LPs and 45 rpm singles came along, and vinyl began to replace shellac. Vinyl (actually shellac) recordings came out before the turn of the 20th century, but the industry really came into being in 1925 when vinyl disc speed became standardized at 78 rpm, making it possible to play discs from any label on any record player. This chart shows the five eras, which are defined by the music delivery format that produced the most revenue during the period.
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