Disturbed's fourth studio album begins forebodingly with an apocalyptic air-raid siren akin to Black Sabbath's "War Pigs," but where "War Pigs" rails against waging war, the title track here punches with prideful fighting lyrics that almost sound tailor-made for a military recruiting commercial. Those hardcore metal fans who have previously turned their noses up at Disturbed for not sounding heavy enough (or for being too melodic) may be pleasantly surprised at Indestructible's more virulent playing and conceptual songwriting, which is not to say that the chorus on "Inside The Fire" isn't as catchy as the song is brutal. David Draiman sings and screams like a man possessed as his lyrics reveal a dramatic narrative about someone who can only become reunited with his suicidal lover's soul by taking his own life to join her in the fiery cantos of hell. The Bonus Track version comes garnished with three songs recorded from Disturbed's live performance on December 17, 2005 at Chicago's Riviera Thrature; "Stricken," "Down With The Sickness," and "Just Stop" all sound much more raw and explosive sans studio production.