I mean... yeah sorta? In the sense that they are playable like podcasts now even though they predate them by almost a century
. They're literally recordings of radio shows from the 30s to 50s in mp3 format. The advantage is that tons of them are public domain now so they're free and easy to acquire and they make for nice 30-50 minutes bits of entertainment.
Right now my short list for tomorrow's listens are episodes of:
1) The Shadow - one of the inspirations for Batman and was also a 90s movie starring Alec Baldwin (which was... fine I guess). The early seasons of the show from the mid-30s starred Orson Welles in the title role
2) The Saint - based on the novels that later also became a TV series starring a pre-James-Bond Roger Moore, this radio version instead features Vincent Price in the starring role
3) The Adventures of Philip Marlowe - adaptation of Raymond Chandler's iconic detective noir character/novel series
4) Horatio Hornblower - adaptation of CS Forester's swashbuckling adventure novels of pre-Victorian naval adventures. Was made for the BBC by a British cast but they passed on it and it aired in the US instead
5) The George Burns & Gracie Allen show - a vaudeville/sketch comedy starring the husband-and-wife comedy duo. Burns is probably more known now for his run of movies into the 80s, but the star of this show from the 50s was Allen, who was a master at this sort of twisted illogical logic that baffled everyone around her for some fun jokes. The show also often featured major hollywood guest stars like Cary Grant, Rita Hayworth, Cecil B DeMille, or even early turns by Alan Young (mostly known after this for starring in Mr. Ed, but also in the 80s as the original voice of Scrooge McDuck in Ducktales)
And that's just a drop in the bucket of what's out there. Sure the acting can be a bit corny since it's from that area where they hadn't yet shaken off the sort of over-acted melodrama that played on the stage, but it's still entertaining. For example, the era of OTR is when we got Orson Welles' original broadcast of War of the Worlds (as part of his Mercury Theatre series)