Google launch a new service at the 2013 Google IO conference called Google Play Music All Access. This is a streaming radio service (competing with Spotify and RDIO) which typically costs $US 9.99/month for all you can eat music.

My industry contacts tell me that Google is putting the finishing touches (aka finalizing the music library agreements) on the service and expect it to launch early September. We expected it to cost the same $9.99 a month (same as the US price). 

You will be able to use this on IOS through some third-party apps (my favorite is gMusic).