Some studies have found that heavy metal music can lead to increased feelings of anger in some individuals. For example, a study by researchers at the University of Jyväskylä in Finland found that listening to heavy metal music led to increased levels of anger and aggression in participants who had high levels of trait anger. Another study by researchers at the University of North Texas found that listening to heavy metal music led to increased feelings of anger and hostility in participants who had a history of aggressive behavior.
However, other studies have found no significant effect of heavy metal music on anger levels. For example, a study by researchers at the University of South Florida found that listening to heavy metal music did not lead to increased feelings of anger or aggression in participants. Another study by researchers at the University of Amsterdam found that listening to heavy metal music actually led to decreased feelings of anger and stress in participants.
It is likely that the effects of heavy metal music on emotions depend on a variety of factors, such as the individual listener's personality, musical preferences, and the context in which the music is heard. For some individuals, listening to heavy metal music may provide a cathartic release for negative emotions, while for others it may actually increase feelings of anger and aggression.