I KNOW WHAT I’LL BE DOING THIS EVENING: Listen to 385,000 Vintage 78 RPM Records for Free on ‘The Internet Archive.’ “The 78 RPM disc format became available in 1898. Made of shellac resin, they came in several sizes but were known for their 78 rotations per minute. They were recorded through a horn (later a microphone), with sound causing vibrations that engraved a pattern in the disc. The shellac material has not aged well, and some records can break from even being picked up. As such, digitizing these recordings is crucial.”