There is one band called DYS and one band called Dys. Last.Fm mixes them up: 1.) Formed at ground zero of Boston's legendary straight edge hardcore scene, DYS, stood for "Department of Youth Services" but they jokingly told everyone it stood for "Dave You Suck".
They rose out of SS Decontrol's Boston Crew, going on to help establish the city as a center of the movement along with Negative FX and Last Rights.

Read more about DYS on Last.fm.