Karacalla said

Rite, so if this was the case clinical depression would not exist. 

It does. Even with treatment.

According to you, there is a pill that will make people not feel the loss of a family member, or un do heartbreak after a split with someone they love. 

Science is not an exact.

Explain to me why you are you then.   

There are pills that help people cope with extreme trauma or grief but they have side effects that are damaging to the brain and body if taken too much or improperly. Also depression isn’t the same as sadness. 

Music is a lot like love, in that both have been shown to stimulate the same neurotransmitters. Our species has evolved in herds and things that bring people together tend to tickle those same parts of the brain.

Music, religion, chocolate, sex, dinner with the family, fire, etc. Gathering feels good because it’s most of that, on top of booze and pot and whatever else.