The original 1968 film The Producers also centered around putting on a Broadway show -- as have countless backstage musicals from the 1930s on.
Broadway meant a lot more to the general public in '68 (almost a half-century ago). Musical tunes used to play on radio stations nationwide, and film adaptations were much more common than they are today.
To be fair, radio back then had actual DJ's who picked what music they played. Some stations were just radio stations meaning they played the popular music of the time and had time slots where older music was played and different genre's.
There were no predetermined robot play lists. A guy who got a studio recording could get his music played along side the big name acts of the time. Where it would, if successful spread from one station to another.
I was listening to JACK 97 FM here in town one day while rearranging my room and cleaning out my closet and drawers and filling boxes with old clothes to give to the St. Vincent de Paul Society and I noticed that the song rotation had begun again, same songs same order as before.
Radio today is a shadow of what it was in the 60's. Radio, except for specialized stations found on satellite radio or your cable music channels (Not MTV, but where music is played and a picture of the band and the name of the song appear.) play music of different genres. Those too are on a play list but it seems much longer than the ones on radio. For a week I could tune into JACK 97 at about 9:15PM and hear Pat Benatar's "Heart Breaker."
Sorry for hijacking my own thread. If someone wants to start a thread about Radio, be my guest.