Hi. My name is Roman. I'm trying to find a song. It's on iTunes but not Spotify, and I would love and appreciate it if it was on Spotify. It is called "Carry On by Olivia Holt. " Please reply and add it to Spotify. Thanks!
I just did some digging that song seems to be an exclusive single in iTunes, even though the artist wikipedia page says that song is a promotional single it would seem iTunes released it exclusively for the Disneynature Bears, Released: Mar 29, 2014.
As has been stated material released on spotify is always down to either the artist or the label.
Edited to add it would also seem to be a promotional single as a way to donate to nature conservation to parks worldwide, so that would explain the exlusive iTunes release they donate to the fund everytime the single is purchased.