I love listening sad songs
Ashes to Ashes by David Bowie is a great sad song!
Yes.  I listen that song early week.
I think it is interesting that we enjoy sad songs when we are sad, but it's because it elevates our mood and helps us express ourselves.
Yes I am very interested in sad songs
Listening to sad songs can actually make us happier once we listen to them.
Yes.  Sad songs are remaining our happy moments.
It also gives us a sense of nostalgia. 
Hmm...That was amazing one.
The nostalgia comes from how connected we feel. I guess that's why a lot of my friends listen to the same music.