Wick, I can’t recall the last time I listened to a cassette tape.
UPDATE: [From Wick]: Others suggested by FrontBurnervians are scribes, town criers, Pony Express, and telegraph. If we’re only talking content media, and not distribution systems (such as cassette tapes and Pony Express), I would say town criers and pamphleteering, which was also big in the 17th and 18th centuries.