Listening habits almost unchanged since the 50ies?? Nowadays almost everyone (young) walks around with headphones on in public, in school and at work, even at h

Listening habits almost unchanged since the 50ies?? Nowadays almost everyone (young) walks around with headphones on in public, in school and at work, even at home, listening to music of their own choosing. Compared to the 50ies, 70ies or even the 90ies, several things have changed significantly: How many hours of the week that people listen to their own music has increased tremendously. The number of artists and genres that people listen to over a year increased massively. How long an average song is in "the rotation" has decreased massively.