Through the Great 78 Project, the Internet Archive has been digitizing the audio from 78rpm records produced from 1898 to the 1950s. Over 25,000 high-quality recordings are currently available from artists like Edith Piaf, Irving Berlin, Lena Horne, and Duke Ellington. This preservation is important because the discs are fragile:
78s were mostly made from shellac, i.e., beetle resin, and were the brittle predecessors to the LP (microgroove) era. The format is obsolete, and just picking them up can cause them to break apart in your hands. There’s no way to predict if the digital versions of these 78s will outlast the physical items, so we are preserving both to ensure the survival of these cultural materials for future generations to study and enjoy.
From 1939, here’s Judy Garland singing Over the Rainbow. And this undated recording of Edith Piaf singing La Vie En Rose. I could listen to these all afternoon.