ATOMIC HEAD.. is born in october 2004 when Seb starts with the idea of starting a band inspired mostly in Megadeth, Metallica and Exodus, starts the composition. SEb meets Luis F in bass and in april 2005 Diego joins the band on drums. In november, Luis decides to leave and Atomic Head keep going in their musical way. In march 2006, Luchín and Gabo join the band and a debut CD is now ready, but Gabo decides to quit the band and Hugo is the new bass player. The debut EP was launched with INANNA in november 12, 2006 at bar Trifulka, Santiago, Chile. It contains 5 original songs.
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After the 2 shows in december with Gestos Grosseiros from Brasil, Diego leaves the band. In march 2007, Hugo is fired and then in may Luchín is replaced by SEb's former guitar student Joaco. In 2008 new blood joins ATOMIC HEAD, Pollo in bass and Juanito in drums. Joaco leaves the band in october 2008 and Luchín comes back. After a 15-month break and with MAX, the new drummer, the band is working on their new songs for their upcoming full-length.