The document summarizes a study that tested the effects of different music genres on aggression levels. It outlines 4 hypotheses about how exposure to violent rap music, Christian rap music, or pop music following rap would influence aggression. Participants listened to songs or watched music videos and completed an aggression scale afterwards. Results found no significant differences in aggression levels between conditions, failing to support any of the hypotheses. This suggests people may become desensitized to music or maintain their self-concept separate from the music.