It is music which promoted things which are proper of this world and not of the world Jesus Christ promises to his followers and those who believe in him and his father. If you tune in the radio at some random hour, you would find specific stations which broadcast music which have a lot of content about crime, murder, violence in general and people stealing others, it is a plain glorification of negative things within society which (for some reason) singers use them to generate income and catch the attention of the youngest within their societies.
It is ironic, because those artist which glorify violence and crime are actually the last people who would be in a situation which could push them towards committing crimes for survival, as they the millionaire in detriment of destroying the values and morals of an entire generation.