The details are a bit murky at the moment but if Google is going to launch a music service that does not offer any method of purchasing or subscribing to music it will probably alienate a lot of users. Music sales may be down but they're not nonexistent. Lots of people don't pirate music for whatever reason. The whole experience will have to be pretty seamless in the way it scans and updates any music you bought from other services. For Google that's problem because you're probably buying that music from Amazon or Apple. Why not just use their cloud music services instead? It makes things a bit too complex. Amazon is in a better position but it'd be kind of shocking if the labels don't retaliate against them. It seems to me both Google and Amazon are forcing the labels back into Apple's camp here.