His proposition may sound simple to him, but it really isn't. It becomes very hard to ensure you are being paid properly in his proposed scenario, I would personally expect it would create even more controversy, or extremely long payment records every month for artists. For instance say we have 500 paid users. Lets call them user1 through user500. Each user listens to the same number of songs a month as the value fol…
So the per play rate should be determined by taking 70% of the user's subscription, dividing that by the number of seconds of streaming that user streamed that month and then multiplying that by the number of seconds that user streamed the artist's song (since songs can be stopped mid-song).
Regardless of how they bill, it's likely that artists will have to, for the most part, just trust Spotify. There can, and should, be independent audits of the billing code. It seems an analogous situation to what the NGC does around computerized gaming systems. Users have to trust that the system is fair, but the NGC is very thorough about checking that code complies with applicable laws.