Obviously a little more difficult than previous offers since you need to enter FOUR product codes, but still a solid deal if you can come up with the 4 caps. I know many people have them laying around the house.
Might not be available on all accounts, so YMMV.
Directions:
Log into or create: Coke Rewards Account coke.com/offers (not available on the app)
Click: "Rewards"
Scroll down to: "Kick Back With Ice Cold Music Perks"
Enter/Scan: 4 Product/Cap code
First 25,000 only. Once the 25,000 number is reached, the $2 iTunes Code will be added to your MyCoke account.
https://us.coca-cola.com/offers/