The way I think about it is that music is associated with emotions, people have a finite number of emotions, and can associate a finite number of songs with eac

The way I think about it is that music is associated with emotions, people have a finite number of emotions, and can associate a finite number of songs with each emotion. Once you "fill up your slots", there's less incentive to find more music (or rather, it's harder for a new song to earn its way in). Good luck to any aspiring songwriters looking to unseat "Walking on Sunshine" from my happy slot, or Baby Mine from the 'love my child' slot, for example.