DYS was a straight edge hardcore punk band from Boston, Massachusetts, and part of the notorious Boston Crew along with contemporaries such as SSD and Negative FX. They released two LPs: Brotherhood, an album still held in high regard by fans of hardcore music, and DYS (i.e., self-titled), an album that is more a hard rock or heavy metal album than a hardcore album. Both albums have been reissued together on a CD by Taang! Records (titled Fire and Ice)