Sad vs Happy

In class when we were talking about if more people listen to sad music in sad situations or if more people listen to happy music in sad situations.
I said that I normally listen to sad music in sad situations because it makes the most sense, because you are able to relate.
When we listened to Joni Mitchell in class I found that her music would be considered sad in my opinion because of the slow melody and the story behind it, this type of sad music is what i normally go to and I found it interesting to hear how others do not do the same.