Continuity mistake: When Dr. Frankenstein introduces himself to the monster with a soothing "Hello, there", his right hand is on the restraint over the monster's chest. The next shot shows the doctor placing his hand on the restraint again.

Young Frankenstein (1974)
Plot summary
Directed by: Mel Brooks
Starring: Gene Wilder, Madeline Kahn, Marty Feldman, Peter Boyle, Teri Garr
The grandson of Dr Frankenstein is located and given the castle and belongings of Dr Frankenstein as stated in his will. The grandson then stumbles upon his grandfathers private library and scientific notes. He then uses these to try his hand at reviving dead giants like his grandpappy did.
Frankenstein is young.
Inga: Dr. Fronkensteen! Are you all right?
Fredrick Frankenstein: MY NAME...IS FRANKENSTEIN!
Trivia: Another time you can see Gene Wilder laughing when he's not supposed to be is after he finds out the project failed (the quiet, dignity, and grace speech). He starts strangling the monster, and you can see that he is stifling laughter. Finally, he can't hold it in any longer and proceeds to partially hide his face behind the monster lying on the table in an attempt to cover up his smirks (but you can still see that he is laughing).
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Answer: It's called "Transylvanian Lullaby" (as they tell you in the film) and was composed for the movie.
Myridon