Audio letter
# 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.

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:

* Wax cylinder
* Reel to reel
* Cassette tape
* MiniDisc
