First of all, this is IDC, who always pulls numbers out of their ass. Second, to try to classify android as a unified market boarders on absurdity. It's no way to look at the market and is pretty much meaningless.
The music industry is made up of morons - the all-you-can-eat streaming business model is killing the industry and is grossly unfair to the performers and songwriters as they are getting paid in pennies. Stupid. Stupid. Stupid.