A kitten softly purring. The sound of rain on pattering outside the window. Slayer's Reign in Blood. These are all sounds that reduce stress and reduce anger -- at least, that's according to a study by researchers at the University of Queensland in Australia.

The researchers wanted to fully investigate the idea that "extreme" music like heavy metal and hardcore punk make listeners angrier. Instead, they found the opposite. Extreme music can help listeners process anger, make listeners happier and more active and lower stress levels, the study found. "We found the music regulated sadness and enhanced positive emotions," said researcher Leah Sharman in an interview with the Guardian. "When experiencing anger, extreme-music fans liked to listen to music that could match their anger."

You might also want to listen to heavier music when looking for motivation. "Results showed levels of hostility, irritability and stress decreased after music was introduced, and the most significant change reported was the level of inspiration they felt," Sharman said.

So, next time you're angry or stressed, might we suggest a little grindcore?