What is audio cassette?

Audio Cassette

The audio cassette, also called cassette tape, Compact Cassette, cassette, or simply tape, is a magnetic tape sound recording format. It was designed originally for dictation machines, but improvements in fidelity led the audio cassette to supplant the Stereo 8-track cartridge and reel-to-reel tape recording in most non-professional applications. Its uses ranged from portable audio to home recording to data storage for early microcomputers. Between the early 1970s and the late 1990s, the cassette was one of the two most common formats for prerecorded music, first alongside the LP record and later the Compact Disc.

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Some articles on audio cassette:

Audio Cassette - Successors
... Elcaset was a short-lived audio format created by Sony in 1976 that was about twice the size, using larger tape and a higher recording speed ... Unlike the original cassette, the Elcaset was designed from the outset for sound quality ... It was never widely accepted, as the quality of standard cassette decks rapidly approached high fidelity ...
1981, it was the first commercial album by the group, who released it themselves in 1982 in audio cassette format ... it was re-released by the music label Singing Ringing, again in audio cassette format (UK, 1985), and then by Charrm in audio cassette, 12 inch vinyl and CD formats (UK, 1990) ...
Catch-22 - Release Details
... signed limited edition Leather Bound 1984, Caedmon Audio ISBN 0-694-50253-7, Audio Cassette 1996, Simon Schuster ISBN 0-684-83339-5, pub date September 1996 Paperback 1980, Books On Tape ISBN 0-7366 ... Sanders 2008, Hachette Audio ISBN 978-1-4055-0387-7, unabridged Audio CD reader Trevor Nelson ...