Reminded me of an old project of mine which went no-where.
Twilight Symphony. It had many incarnations, but this was my favourite.
The story followed orphan twins who stumble into a deserted Manor to seek shelter. The manor is haunted by a ghost who plays scores on the piano (that the children find throughout the house), and it transports them to other worlds to find mythical instruments to mend the ghost's soul.
Id love to start it up again, but probably wont.
Its currently my desktop background =D