Replace MP3 player with any of these: all modern desktop metaphors, the smartphone, the concept of an app store. I'm sure I'm missing some. You could even go w

Replace MP3 player with any of these: all modern desktop metaphors, the smartphone, the concept of an app store. I'm sure I'm missing some. You could even go with the automobile, the assembly line, the light bulb, the telephone, and any number of frequently misattributed inventions and innovations if you need to move outside modern technology to see the point.