Be sure to follow these rules before choosing a pre-order track:
The sales start date must be at least one day in the future from pre-order start date you’re adding for the new instant-gratification track.
All instant-gratification tracks or music videos must be cleared for sale in a pre-order territory, or they will not be available.
The combined price of all instant-gratification tracks on an album must be lower than the album price by at least the price of one mid-tier song.