If it’s not a single on iTunes or Amazon then it doesn’t exist

There’s an article on Techdirt discussing the motivation of some musicians for not putting their albums up on iTunes. My personal experience is that if it’s not on Amazon or iTunes then it simply doesn’t exist. My family’s entire music infrastructure has been based on the ipod and apple tv. If I can’t purchase singles that will be easily playable on these devices, then I don’t want it.