Signed in, changed the language to English everywhere.
Added a credit card to payments, specifying the country - Britain.
Connecting with UK IP and getting:

>The Google Play music player is currently available in select territories.

I'm from the post-soviet country.Google Music is not in the country.

Maybe someone had a similar quest?

3 Answers 3

I did it when I logged in with ip USA
Perhaps your UK IP is in the list of popular proxies? And Google knows this well.As an option, of course
You need a server for such business.Desirable in the US