ITunes Gift Card obtained for ITunes music

Having bought the ITunes gift card again, I should be able to make more purchases from the ITunes store but instead of downloading those paid apps, I downloaded some tracks from Groove Coaster 3 OST or Groove Coaster OST Boost. It may be handy for planning to rearrange/remix them when possible as well as to find out on what Groove Coaster 2 & 3 System BGMs are like completely.