Originally Posted by Belphegor

People who are young adults/teenagers now believe today's music is good.

People who were teenagers/young adults in the '60s, '70s etc. believed the music from their era to be good.

Any era has good and bad music (the bad significantly outweighs the good though), it's just that since the passage of time conditions us to only remember the good stuff from the past (because the best things inevitably rise to the top with time), we start to mistakenly believe that only the old stuff is worth something. Once this generation becomes old enough, they'll hate the music of the next generation, the cycle never ends.