The 1900s: The player piano
In the late nineteenth and early twenties centuries, pianos became very popular and rich families bought ‘player piano’.
A player piano plays music that is programmed on paper rolls with holes in them, and you can also play it like a ‘normal’ piano.
In the mid-1920s, player pianos began to disappear, mainly because the radio (it was called the wireless in those days) got more popular.
来源：MSE指定教材 English In Mind (student's book 2)