Last year we gave props to hip-hop's key figures. Now we're celebrating four of metal's most imaginative groups. Our Rock Honors show puts Def Leppard, Judas Priest, KISS, and Queen in the spotlight for the evening, explaining how each band came up with its unique sound, and measuring the influence each has had on modern music. Godsmack, Foo Fighters, and the All-American Rejects help us praise our heroes and turn the place upside down.