Radio was not "live and local" in the Golden Age of the late 20's to the earlier 50's. It was national: Red and Blue and CBS and later NBC, CBS, ABC and Mutual. Almost all the "listened to" programming was nation-wide on networks.Yes. Don't look now, but...we are in America. And the "live and local" concept that began in the Golden Age of Radio, and through the 1950's, 60's, 70's, 80's and 90's made Radio the success that it once was. IN AMERICA. The industry has been ruining what made it great by cannibalizing itself for years. Not sure why you're defending the downfall.
Congress tried to prevent any individual stations from having wide audience area coverage by limiting the power of stations to just 50kw for a few, 5kw for many more and 250 watts for about 1,000 more.
The high cost of interconnection prevented music formats from "going national" but if cheap distribution had been possible, we would have done national and regional formats in the 50's and 60's. By the 70's, we got thousands of stations running taped "unwired network" formats and then satellite allowed simultaneous broadcast of formats on huge numbers of stations.
If you listen to the national stations in places as diverse as France and Perú and Chile and Spain you will hear much better music formats with excellent talent, the most interesting artist appearances and the like... using dozens if not hundreds of transmitters to cover an entire nation.
So much for "Local".
Now, as to "live" that began to die when Ampex introduced tape recorders and Bing Crosby could do one show and have it run in each time zone at the same local time. Then we got carts, and automation and could have a station sounding live while actually being 100% recorded. Then we got computers, and it became even easier to create a station with little or no live programming.
So much for "Live" (which was a myth all along).