Consider revenue per song:
- £0 per downloaded song via torrent
- £0.003 per streaming song
- £0.70 - £1 per album song on CD
- £0.99 per song on iTunes
- £0.99 per single song on CD
- £1 per single song on 7"
- £1 per 10 seconds of song in a simplified midi track... equivalent to a per song value far higher
Lesson here if no-one saw it, the more you control the means of distribution and playback, the higher the price you can extract from the listener.
Long-term, when the final vestiges of openly available music vanish (CDs gone, streamed content heavily DRM'd), prices will definitely rise, or at least... those who most control the critical parts of distribution or playback at that time will be able extract the most revenue from the total revenue that exists. I believe that the pressure will be on the labels and artists at this time, and that even with technology helping to reduce the cost of recording and releasing music it's going to be hard on them. The winners are most likely the distributors of music across all platforms - Spotify look like a good bet.
This is the subject of a piece of work I did for the independent music labels in the UK in early 2000s and it's still relevant.