Watch "The Ultimate Test: 440 Hz vs 432 Hz" on YouTube
The Ultimate Test: 440 Hz vs 432 Hz
Here, the two different tunings, 440 vs 432, are compared. Listen carefully; one of the two is much more "rich" in harmonics. Perhaps our ears simply perceive it better?? (I don't know) The fact remains that if you have a trained ear, you cannot help but notice the difference.
 
Look at "Bluvertigo Iodio" on YouTube
Bluvertigo Iodio do you remember when you have to go to the beach with a friend who argued two days before with the girl, and they decide to make peace and meet just when you have to leave?? Of course now he’s not going with you anymore. (I can only curse)