The world's oldest-known whale song recordings tell a story about the changing ocean
Researchers at Woods Hole Oceanographic Institution have discovered a recording of humpback whales off the coast of Bermuda in March 1949 buried in their archives, marking the oldest-known recording of whale song.
https://www.cbc.ca/radio/asithappens/oldest-recorded-whale-song-9.7130961?cmp=rss