While not firearm related, I know many gun enthusiests also have an interest in both technology and history. The link below is an article about very early ‘audio recordings’. It includes a recording of the very first recording by man that is known.
The recording pre-dates Thomas Edison’s and was done by a French man. However, his system only recorded the voice pattern; having no means of playback. But researches noted the pattern was very similar to modern digital audio wave recordings and reconstructed it.
Frankly, I just find it neat to listen too. Think of it as the very first “podcast” downloand.
http://www.cnn.com/2012/02/08/us/earliest-recordings-sound/index.html?hpt=hp_bn1
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