What horror movie is this from my childhood?

Of all the movies that I saw, and quite a few scared me once I realized what was going on, like Jurassic Park and Jumunji, my first true horror movie was actually really terrifying. One problem, it was probably pretty forgettable since I completely forgot its name. However I do know some pretty specific plot devices so hopefully Yahoo Answers will not fail me. I recall very little of the beginning other than a very ominous mansion, where several people are to stay, for what reason I forget. Remember, this was when I was like nine or ten. They cannot leave during the night, due to the fact that the groundskeeper has the only key to the mansion gate. However, one of the people staying the night is grievously injured while playing some sort of stringed instrument, either on the hands or the face.... Pretty sure it was the face since that scene actually scared me pretty badly, and she is allowed to leave since its early enough. Naturally, the rest of the group completely ignores the fact that this happens like all horror movies, and they stay. I recall a very large painting of a man that owned the mansion where the grand staircase parts being very prominent in the films plot. The female focus slowly uncover the mysteries of the mansion and a very clear CGI animation of children ghosts in the curtain and/or bed. After a bunch of scary scene slowly picking off the other characters in gruesome ways, one I think involving the large fireplace in the main hall. Please help me find it.