Question: Download Festival is a British rock festival, held annually at Donington Park in Leicestershire, England, since 2003, it's the  most popular British summer rock and heavy metal festival and has hosted some of the genres' biggest names, including which rock band formed in England in 1978 by David Coverdale, after his departure from his previous band Deep Purple?  
Sentence (from "Whitesnake"): Their early material has been compared by critics to the blues rock of Deep Purple, but they slowly began moving toward a more commercially accessible rock style.
Relevant evidence: No