Listen to Rainbow (From The Original Motion Picture Soundtrack 'My Little Pony: The Movie') online. Rainbow (From The Original Motion Picture Soundtrack 'My Little Pony: The Movie') is an English language song and is sung by Sia. Rainbow (From The Original Motion Picture Soundtrack 'My Little Pony: The Movie'), from the album Rainbow (From The Original Motion Picture Soundtrack 'My Little Pony: The Movie'), was released in the year 2017. The duration of the song is 3:18. Download English songs online from JioSaavn.