There are more artists called Hammerhead:
1) Hammerhead were formed in 1990 in Moorhead, Minnesota in the United States of America. They disbanded in 1996 and reformed in 2010. They released four full length, mostly via Amphetamine Reptile Records, and some 7 inches as well. Their musical style can be described as Noise Rock/Punk/Hardcore.
2) Hammerhead ist eine deutsche Hardcore Band, die im Zeitraum 1989/90 in Bad Honnef bei Bonn gegründet und im Jahr 2004 zwischenzeitlich aufgelöst wurde. Read more on Last.fm