Audio letter

An audio letter is an audio recording sent by postal mail to a recipient. The practice was more common when charges for long-distance telephone services were higher and before the widespread use of the Internet.

A cassette audio letter

Discovered audio recordings offer a unique perspective into that time period and have often been used to present historical context in modern-day radio and television programs.

Media

Media used in recording audio letters include:

gollark: #3, apparently.
gollark: You should, as a result, contrive to have me win.
gollark: Also the times when I dither on selecting a challenge.
gollark: Surely we could offload discussion to GTech™ discussion neural networks™.
gollark: Anyway, we recommend just using relative times or, if you must, using YYYY-MM-DD.

References
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