There's a certain level of skill required to compose and produce a song, but beyond that the genre/style of the song is more important, and which style is better is very subjective.
The best opera singer in the world will not take much business away from a techno DJ who merely presses a "play vocal sample" button, and both genres have their fans.
In a system where people listen to songs based on recommendations fitting their individual taste (where the recommender doesn't assume popular is good) you can have people listening to individual songs from the long tail of many artists.
There's a certain level of skill required to compose and produce a song, but beyond that the genre/style of the song is more important, and which style is better is very subjective.
The best opera singer in the world will not take much business away from a techno DJ who merely presses a "play vocal sample" button, and both genres have their fans.
In a system where people listen to songs based on recommendations fitting their individual taste (where the recommender doesn't assume popular is good) you can have people listening to individual songs from the long tail of many artists.