I’m with Diki on this one, generational change brings new popular music that by and large the parents do not understand and think it to be crap.
Existing types of music do not die out when new stuff comes along and continue to be performed and created, but you will rarely see them in the charts any more, in fact it is quite common for the younger ones to hate everything that their parents like as its not cool, of course as they grow older than just like their parents they expand their horizon, and thus become uncool to their kids. (In the olden days some households were strict by not allowing their kids to listen to any modern music of their time, but only what their parents liked)
Generational change is how the human race progresses in all forms of life, if they don’t then they would just stagnate and die out, therefore when it comes to music, if the parents like what the kids like (And vica versa) then we have a problem, as it means music has become stagnant with a total lack of innovation.

Bill