My vote is for Radio; this made an enormous impact on the Worlds cultural development throughout the twentieth century. I think it is very difficult for us now to imagine what it would be like not to have radio, and how much it has changed things!
Radio has contributed massivly to a cross-fertilisation of musical forms and an expolosion of creativity. Not forgetting the access it gives to a world-wide market; resultant revenues have clearly fed musical development (although it could also be argued that the 'big bucks' are now stifling creativity!).
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