Abstract
@drorpoleg: In 1930, the union of American singers spent the equivalent of $10m on a campaign to stop people from listening to recorded music and watching movies with sound. 1/ When films were silent, theatres emplo……

@drorpoleg: In 1930, the union of American singers spent the equivalent of $10m on a campaign to stop people from listening to recorded music and watching movies with sound. 1/ When films were silent, theatres emplo……
