@ Phil - I got your movie reference - and the answer is so simple if you've seen the movie.  The saddest of all keys that when you hear it causes people to weep instantly is D minor.  Doesn't everyone know that? 

@ Studiox19 - you mistakenly took his joke poll as a serious question.  But as a classically trained musician since the age of 4, I can say that in more cases than not, when you change a key up or down, you do indeed change the mood of the overall piece. 

Combination of the "righ"t key with the "right" combination of notes on the "right" instruments played in the "right" tempo can certainly create moods of are types from happy to tear-jerking sadness.  Just using one composer for example - try Mozart.  Find any of his pieces of music and sample a section that makes you feel a certain way, then put it into a pitch changing program that does not change tempo and see if you feel the same mood when listening back.

This applys to all forms of music including simple pop tunes.  Look at the mood difference between Neil Sedaka's original version of "Love Will Keep Us Together" in comparsion to The Captain & Tennille's version.  Or how different the mood is between Michael Jackson's "Billy Jean", compared to Chris Cornell's version.

You guys get way too serious around here.........

BMoe wrote:

 

Which key gets the dog back?

That's not a key - you have to play the song backwards.