If you were writing a letter to a movie producer what form of address would you use?

Question

I mean in the beginning:

Dear _____,

what would you put there.

And not a specific movie producer.

Answer 1

Like any proffessional letter, if you don't know who you are sending it to 'Dear Sir/Madam'

And end with 'yours faithfully'

Answer 2

production staf/producer of *insert movie here*

is what i would do

Answer 3

I would be simple, yet respectful:

Dear Sir,