There are many users in Brazil with the Google Play Music service active, but only a few are able to install the application on their smartphones and tablets equipped with the Android platform.
Even for those who use Google Play Music, the application currently barred for the Brazilian Google Play Store, which prevents its installation "by official means", if we can say so.
To solve this problem, a group of users of the XDA Developers forum decided to make the installation file (.apk) available to anyone who wants to obtain the service at their own risk.
To download Google Play Music, just click this link. Remember that you need to enable the Android settings to allow apps to be installed by unknown sources.