If i interpreted your question correctly, here goes.
Take for example rapping (Hip Hop culture). It was started in the
States in the 60s by the blacks. At that time, the States is not
very stable socially and racism is a serious problem there. The
blacks had to resort to robbery, thefts and violent crimes to get
money. They grouped up, and commit all sorts of crimes which would
result in riches. After they commited those offences, they would
gather in some place, destroy properties and party. It was at those
parties they started rapping, showing their hate, anger and all
sorts of feelings about the society.
As time goes by, the blacks sees rapping as a part of black
culture.
After hip hop loses its hold as a "blacks only" culture, it became
a trend to follow the hip hop culture. Hip-hop music strayed
towards love and its clothings. It has also become a medium for
showing the "gangsterism" side of hip-hop lovers. Instead of using
the music to show their feelings, it has become a medium for
monetary, showing-off etc.
