Even Humorous Violent Songs Increase Hostile Feelings 
WASHINGTON - Songs with violent lyrics increase aggression related thoughts and emotions and this effect is directly related to the violence in the lyrics, according to a new study published by the American Psychological Association (APA). The findings, appearing in the May issue of the Journal of Personality and Social Psychology, contradicts popular notions of positive catharsis or venting effects of listening to angry, violent music on violent thoughts and feelings.
In a series of five experiments involving over 500 college students, researchers from Iowa State University and the Texas Department of Human Services examined the effects of seven violent songs by seven artists and eight nonviolent songs by seven artists. The students listened to the songs and were given various psychological tasks to measure aggressive thoughts and feelings. One such task involved participants classifying words that can have both aggressive and nonaggressive meanings, such as rock and stick.
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