The purely electric drive system was factored into the equation as early as the concept phase when the gullwing model was being developed.

ENGADGET: Visualized: Mercedes-Benz SLS AMG E-Cell bares all

There are fears, however, that the Prince deal marks a new phase in which established artists will cut record companies and traditional retailers out of the equation.

BBC: NEWS | UK | Magazine | Are free CDs killing music?