As far as hardcore music goes my interest and knowledge is minimal at best but Jairus are a band that have always spoken to me. I have been a fan for the last 5 or 6 years, through which time they have been through many line up changes and split up and reformed again. It is all explained in this very entertaining documentary about the 10 year history of jairus.
Catch them in manchester this october (see a carefully planned festival post)