There are at least 4 artists called Serotonin. 1. Serotonin was a pioneering hybrid of early emo, math rock and hardcore from Tennessee, US. They were active from 1996 to 2002 and their major releases can be found at http://serotonintn.bandcamp.com/ . 2. Serotonin was an old school hardcore rave music project by UK's DJ Krome & Mr Time. 3. Serotonin is an industrial gothic metal band from Dundee, Scotland. http://www.myspace.com/serotoninmetal