When I was young I remember this princess movie where she was captured by a gremlin or something and forced to sing to make him money. She was like trapped in a bubble. I can't remember the name.

It was not Princess and the Goblin, but I remember she did look like the Swan Princess but its not that movie either.

Felix the Cat: The Movie (1988) (http://youtu.be/3NMD3mzgQxw)?

YES I thinks that's it! Thank youuu