Earlier today, Google released a detailed timeline that shows the official dates of the shutting down of Google Play services. The initial rescind of the service will start from New Zealand and South Africa in September. However, for users in other regions, the revoke will begin in October, and by December, the service will be shut down completely all over the world. Also, later in August, Google will stop accepting purchases for music.
A few months ago, Google Play Music allowed its users to transfer almost everything from their libraries including, playlists, albums, artists, songs, uploads, and even the purchased content to the new service, which is YouTube music. The main reason for Google Play Music to shut down the service is the popularity of its YouTube music service.