the most natural form of expression of joy in man is said to be dance. but the most expressive language for communication of this joy and all other emotions is music.
the universal language for emotions is music. and there is no person on this earth who can say that music does not touch her. if it doesn't then she is either dead or soulless.
wikipedia defines music as "Music is an art form consisting of sound and silence expressed through time." but one of the best definitions of music i have come across is here - basking in the light - IV.
have you noticed how we identify with specific songs/artists/lyrics/music? it reflects our moods and our growth. our favorites change over time. and sometimes we keep going back to the same songs even after ages.
and some songs catch the imagination of an entire nation/ age. they literally become anthems for the generation. whether it is 'hotel california' by the eagles or 'we don't need no education' by pink floyd or 'chak de india'.
i remember when i was in school and college, i used to get deeply moved by some songs which would reflect my state of mind at those times. especially when we are going through confusions or phases of infatuation or frustration. (they mostly used to go hand-in-hand :-) )
the beatles used to be one of my favorites in school. and i used to feel that they used to have a song for every mood that i went through. they even had one when i had a bad toothache - 'here i stand with head in hand, turn my face to the wall'. though i am sure that's not what they had in mind when they wrote the song :-) but that's the point. we see our thoughts and feelings getting reflected in certain songs and we identify with them. we feel as though the song was written specifically for us at that point of time.
but i also cannot understand how some people who like music get so focused on a particular genre that they are just not able to appreciate any other. and many of these are people who have a far subtler sense of music appreciation than people like me. even among indian classical music enthusiasts, i am sure you have met purists of hindustani or carnatic who just cannot stand the other form.
i think such a person's heart is just not large enough!