Apple Music is now live across 100 countries. The subscription is Rs 120 per month in India for individuals. Here's how to cancel the subscription, if you change your mind after the 3 month trial period.
In Apple Music, you need to go to account and then click on view Apple ID.
Once you get into your Apple ID just click on Manage Subscriptions.
In the list of subscriptions, you will see Apple Music, along with other services who might have signed up for. Click on Apple Music manage.
In this page, you can turn off Auto-renewal and this will ensure that at the end of the 3 month trial, your subscription is now automatically renewed.