What happens next?

How to subscribe to google play music on pc or mac 
Go to https: // music.google.com in a web browser. 
Using your preferred web browser, open the official google play music website. 
Click sign in and log into your google account.

Pick from:
 (A). Once you log in, you'll get an email address and password that you'll use once you start playing google play music. If you don't have a google account, you can cancel your google play music subscription before you sign into the app.
 (B). This is at the top-right corner of the page; clicking it will display all the sign-in options you can use to sign into your google play music account. Click the play tab in the upper-right corner.
 (C). If prompted, enter your google username and password on the fields provided then click sign in. Your google play music profile will load and display on the login screen.
 (D). It's in the upper-right corner. Sign in with the email address and password associated with the google account that you want to use to purchase the google play music subscription.
(D).