There are at least 4 artists called Serotonin.
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/ .
Serotonin was an old school hardcore rave music project by UK's DJ Krome & Mr Time.
Serotonin is an industrial gothic metal band from Dundee, Scotland. http://www.myspace.com/serotoninmetal
Serotonin is a British depressive shoegaze project.
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