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I can't understand why I feel better or I feel a real joy when I hear some melodies or music that I like. Obviously it affects my brain and "joy sense" components, but why? I know it's only a sequence of sound waves with no real meaning to me. Yet I find a pleasure in listening to music. It's doesn't evoke "good" memories or makeme to want sex, it just makes me feel occupied with a pleasure. 
Anyone knows the answer? 
I'm only up so this will be brief.
You can find a set of constant harmonics for happiness, sadness, whatever if you analyse enough music. It is even possible to assign these at random over other tunes and make people...as a wild example...crease themselves laughing at the death march.
they even isolated a set of harmonics which induce paranoia...if this signal is mixed into an instrument on a track...the instrument is perceived as being BEHIND the listener.
Also, on a related matter, there is interaction between spoken language and music...people who speak differently hear differently, which is a LOT to do with why musical traditions grow up in one country and not another.
I don't feel like getting into this bigtime just now....but the above all comes from reputable publications.