It wasn't a medium, but a source.....the lowly hand-held transistor radio that only played AM, but introduced many of us to the world of modern (for that time) music. Elvis, Chuck Berry, Little Richard, Fats Domino, Little Eva, along with many others that kept us up way past bedtime until the battery died. The fancy ones had leatherette cases, the sound was as low-fi as you could get, but it was a passport to rock 'n roll nirvana and cool personalities called DJs.
Favorite obsolete formats.....
What are your favorite of these? I’m unsure if any stations broadcast in AM stereo nowadays. 8 track, Mini-disk, Cassette, VHS, CED, Beta, DAT, Reel to Reel, Am Stereo, Laserdisc, Quadraphonic, Dolby FM. Surely many formats have been overlooked.