Music has the power to effect our emotions in many ways. Research shows that memory of high emotional charge stimulates the brain to record that and all the other things that were going on at that specific moment.
Our brain connects sounds, smells, and feelings to the event that has occurred and links them together. In the event of a tragedy, if there is a specific sound or musical background, those involved may find themselves experiencing the feelings associated with their tragedy every time they hear that specific sound.
This explains why certain songs create emotions and why the songs we associate with funerals can create sadness. These emotions sometimes even escalate to a physical response, such as sobbing.
Because the brain makes the connection between song and emotion, the same song will not affect everyone in the same way. The song that may create sadness for one, could give another person the strength they need to help them through the grieving process.
There is something about music that evolves over time. When we hear a song we re-live the emotional sequence that happened when we heard it previously. When you start looking at the songs you listen to, pay attention to your emotions.
You might be surprised at how songs effect your emotions. Think of the songs you heard at the most recent funeral you attended? Is there an emotional response to any of those songs?