Music is the aural transcription of nature. As I listen to Beethoven, my mind is hurled through space & time. I float through tranquil oceans and pastoral landscapes. Mozart encapsulates life in its entirety. Tchaikovsky reminds me of the sweet moments I had spent with my love. Debussy helps me rediscover solitude and embellishes my mind with benign thoughts.
Indeed, music is one of nature's most creative forces. Mathematicians have discovered some intriguing facets about it. I had read somewhere that there is an uncanny correlation between the notes that a pianist may play on his keyboard and the corresponding logarithms of their frequencies! Of course, this happens only when melody and not dissonance is created.
Here's yet another interpretation.
Whenever our brain interprets an audio frequency, it immediately expects a follow-up by one of certain frequencies. Once this expectation is met, it once again expects another frequency. This is an iterative process, giving rise to a chain of expectations and their fulfillments. This is what constitutes melody( or music).
However, when this sequence of expectations is not met and the brain goes haywire regarding what to expect( eg: as a result of a completely random sequence of frequencies), dissonance( or noise) is created.
I guess this partly explains why different people have different musical inclinations. After years of listening to a certain kind of music( which inherently has a specific pattern or style), the brain gets conditioned to expect that type of pattern everytime music emanates. Consequently, I may prefer Beethoven to Bollywood, yet someone of lower intellect may only have it the other way round!