Well, all of the music available on iTunes, Amazon, and the Pirate Bay has already been produced, it just needs to be distributed.
If I want to pay for music to be produced, I use Kickstarter. (Or go to concerts, since playing a song live could be considered a new production)
It's a historical accident that we use charging for distribution of music to pay off debts incurred while producing the music.
Of course, paying 99cents to have my phone download a song in the background so I can play it in the next five minutes is worth it to me - cheaper than a cup of coffee, and I don't have to do any work. So the old system of charging for distribution isn't totally dead.