I'm sure it's well known, but for anyone interested, I'll break it down.
Open iTunes. Click 'Account,' press 'Sign In.'
Click 'Create Account'
Now make a burner e-mail & plug in fake info.
Use an old Visa Gift Card if you have one laying around (Doesn't Need A Balance)
Confirm e-mail. Then, navigate to the bottom of the 'Store' tab & click '3 Month Apple Music Trial'
Follow Instructions & voila.
TIP: Select family plan to use across multiple devices.
Have a Good Day Guys!