Need a title for an old animated film
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!