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Sweet Jane, it was mentioned above how to find the Hidden House.
It is located in the upper left corner of the map; there is an entrance to a cave, which is initially guarded by air elementals and then by cyclops. Inside, you will need to pass the test of the Dragon Knights: fight all types of elementals and, for dessert, fight Cyril. After completing this task, the gates to the underground necromantic castle, where George is located, will open.
"Sorrowful Song" is a weapon of the dynasty. It is located near Cordelia's castle; there is a place illuminated by bright light and guarded by a dozen celestial warriors. The quest "Find the Sorrowful Song" is a side quest; it is not necessary to complete it.