Beauty of Minus 4 for Musicians

Any song when you play it in the transpose minus 4,  you will hear a beautiful changed version of it while you singing. It is not applicable in all cases. But in majority it will work fine. It will be heard only while playing instrument or when you sing on go with the instruments. I dont guarentee with the already made karaoke as it is recorded and done mixing and also added reverb like that stuffs. 

Eg when u play a song in scale E major - Play that in C Major

Stay tuned for much more tricks !!!1
Pls do write your doubts in your comment box. or if there is any suggestions.