We knew Google Play Music was coming to IOS and now its official.  For $9.99 a month, you get millions of streamable songs and you can even cache them for offline listening. 

The service is flexible enough to stream different qualities of music (you decide) which could be useful when on a bad network or when using too much bandwidth.

Unlike Apple's iTunes Radio service, it is cross platform (important if you live on both ecosystems). It's now available in 21 countries (my native Canada is not included):

1. Australia
2. Austria
3. Belgium
4. Czech Republic
5. Finland
6. France
7. Germany
8. Hungary
9. Ireland
10. Italy
11. Liechtenstein
12. Luxembourg
13. Mexico
14. Netherlands
15. New Zealand
16. Portugal
17. Russia
18. Spain
19. Switzerland
20. United Kingdom
21. United States