I can't remember the name of a certain movie I watched when I was a little kid. I remember there was a princess who sang a lot and there were I believe maybe trolls that opened up a magic door for her to get around. And there was a warrior guy that was trying to save her because someone kidnapped her father and was keeping her prisoner. I know the trees are possesed as well. It was made I think in the late 80's or 90's. If you could help I would appreciate it so much!

It's pretty far fetched, but maybe "Little Nemo: Adventures in Slumberland" (1989) everything you mentioned is in that movie except there are slight differences to each. So it may not be what your looking for.

Previously asked and answered:

https://www.askmehelpdesk.com/movies...troll+princess