The classical roots of heavy metal go deep, from traditional to progressive to symphonic to power metal. A 2008 study by scientists at Heriot-Watt University in Edinburgh, which surveyed over 36,000 music fans from six different countries, found that fans of heavy metal and fans of classical music have very similar personality types. According to the study, fans of both genres tend to be creative, introverted, and at ease with themselves.
Other studies have indicated that the link between heavy metal and aggressive tendencies may not be as clear as many believe. A 1997 study by Gowensmith and Bloom in the Journal of Music Therapy found no connection between heavy metal and heightened levels of anger in participants who were already heavy metal fans, suggesting that individual music preferences affect reactions to heavy metal more than the music itself.http://www.themanitoban.com/2013/12/metal-mistakenly-maligned/17983/