This is a timeline documenting the events of heavy metal in the year 2004.
Newly formed bands
A Dozen Furies
A Hero A Fake
Abigail Williams
Adept
After The Burial
Age of Silence
The Agonist (as The Tempest) Ahab Alestorm Alter Bridge Amaseffer Amesoeurs Architects Art of Dying Baptized In Blood Be'lakor Beneath The Massacre Beneath the Sky Big Business Binary Code Black Tide Black Mountain Blackthorn Blood Tsunami Bloodbound Bring Me the Horizon Catalepsy Celestiial Cellador Chrome Division Claim the Throne Cor Scorpii Dark Empire Dead Congregation Devil Sold His Soul Enforcer Escape the Fate The Faceless Finsterforst Genghis Tron Gnaw Their Tongues Havok The Human Abstract Imperia Intronaut Lich King Massacration myGRAIN Royal Thunder Russian Circles Savage Circus Saving Abel Scale the Summit Scar Symmetry Skiltron Sturm und Drang To-Mera Torche Tribulation Triosphere Veil of Maya Vreid Warbringer Wolfmother
Reformed bands
Extreme (for a few shows) Glyder Megadeth Mötley Crüe