Title to an 80's fantasy movie
My friends and I are on a quest to find the title to a fantasy movie from the 80's. All we can remember is it has two kids about 9-10 on a quest to find a man in a castle w/ a heart of stone and to kill him w/ a sword they get late in the movie. They do kill the guy, when they do, his heart becomes real. They are playing panflutes I believe throughout the whole movie, and somehow it helps them on their quest. It isn't animated or anything, but if you could help me find the title that would be lovely and we could die happy people being able to watch it one more time. Thanks