In "Young Frankenstein", Frederick von Frankenstein (Fron-ken-steen, mind you) moves into his grandfather's castle and continues the work of his infamous relative (Victor von Frankenstein from the Mary Shelley novel). He finds a new body, surgically inserts a new brain, and brings his creation to life using the same method as the original. Because his assistant Igor (Eye-gor, grandson of the original) grabbed the wrong brain, the monster is violent and aggressive.
The housekeeper, Frau Blucher (horse whinnies) - who loved Victor - sets the monster loose, stating that he is gentle as a lamb and loves violin music. Oddly enough, playing the violin does indeed seem to calm the monster.
Why did Frau Blucher (horse whinnies) think that this new monster was the old one (or did she), and why did music calm both monsters?