To buy music with an iTunes or Apple Gift Card, you first need to to add credit to your Apple Account balance . Once redeemed, Apple's billing system automatically uses your store credit first for any music purchases until the balance is gone. 1. Redeem Your Gift Card
: Your balance can also be used to pay for an ongoing Apple Music subscription on any device, including Android.
: Open the App Store and click your name or sign-in button in the sidebar. Click Redeem Gift Card at the top right and enter your code.