"It is people's shared experiences of a song that makes a song most valuable" You are definitely right that abundance leads to a decline in shared experiences.

"It is people's shared experiences of a song that makes a song most valuable" You are definitely right that abundance leads to a decline in shared experiences. I’m the only person I know who listens to the music that I do, but of course I treasure that music. But beyond my anecdotal experience, from sites like Last.fm it appears that listeners really began to fragment by the 2010s; with so much on offer now, people don’t necessarily listen to the same music as even their closest peers. DJs, too, have spoken about the decline of the well-known banger when they are being flooded with hundreds of new tracks every week. Moreover, computer mixing today means those tracks might get so cut up by DJs (e.g. taking a bass line from one track and a synth line from another) that they become well-nigh unrecognizable to even the savviest trainspotters.