The album waxaa soo saaray Erna iyo injineeriyada by soo saaraha iyo injineer si fiican u yaqaan Andy Johns, oo loo yaqaan injineernimada Led Zeppelin ee Led Zeppelin IV. Single ugu horeysay ka albumka, "Speak" ayaa la sii daayay on February 14, 2006. albumka ugu horeeyay ee kaalinta koowaad on Billboard 200, iibinta 211,000 nuqul toddobaadkii ugu horeeyay. IV ayaa tan iyo markii la shahaado dahab ah.
si ay ugu soo saaraan album ay ugu fiicnaayeen