Now this is exciting …. Google play have, or are just about to, introduce a new service in the US called Google Play Music All Areas.
With this service, for which you pay a monthly fee, you can stream any track in the store + your own uploads (up to 20,000 tracks). In other words, there is no distinction between what is ‘rented’, versus what you own.
The icing on the cake is that as of Thursday 16th May 2013 all our music will be available like this, too.