Ok - not audio but ...

https://www.dailymail.co.uk/news/article-7161261/National-Archives-warns-20th-century-Australian-history-lost-2025.html

Fears large chunks of Australia's 20th century history could be lost
forever unless priceless film archive is digitised by 2025

 *   National Archives has 220,000 hours of historic footage on old
magnetic tapes
 *   The majority or 60 per cent of that content is still be be
digitally preserved
 *   Agency's director-general said content could be lost forever
within six years

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