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I love music because it brings out emotions. Music is incredibly powerful- as you said lastresort, it can make us happy, excited, sad, relaxed, pumped up, etc.
Humans are sensitive to stimuli- sound, light, air/food particles and touch. Music involves the combination of sound vibrations which stimulates the audiotory centre of the brain via the ear. It is similar to when we see something, our brain is stimulated, or when we smell or taste some nice food. When our brain is stimulated we evoke emotions- which is a natural mechanism to cope with the situation
Some songs gives us the 'chills' or goose-bumps especially if it is a sad song. When music evokes a past sad emotional experience it can give you the 'chills'. For example remembering a past break-up or death. This has been an evolutionary process. Basically these emotions are caused by the release of chemicals from the brain (i think in the hypothalamus part- which controls responses like increased heart rate, sweating, gooes-bumps).
I've heard before that sad music is often in the minor key rather than the major key. It is also usually slow and quiet. Play a sad song you know- you may notice that it mimicks wails or sighs of mourning.
When you can't get a song out of your head I think it is usually because the song is repetitive or has an unusual time signiture. Also, sometimes the important songs to us were heard in our first 15years of our lives, and then can become annoying if you hear them too much.
Songs that get you pumped up usually have a good rythm, tempo and something that is catchy. They can also be exciting and energetic. Music that relaxes you is usually, slow and has a soothing feel to it.
"The summit is just a halfway point"
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