Favorite scream in rock?

Awesome thread. So many great screams/screamers listed here. I need to add one from my youth. Ted Nugent. He was a consummate screamer back in the day - check out Double Live Gonzo. Great example is the track Motor City Madman. If you ever saw him back in the mid 70’s, his shows were a skull-splitting loud, "energetic" relentless assault on the crowd to say the least... 

He lets out quite a few screams in this 10+ minute ditty, (3:10 mark, 5:08, 5:45 for example), but the crazy one lead-up starts around the 7:36 mark. If you don’t want to play the whole song, play it from there and let it ride. 8:10 mark or so is the one.

So, with that context, turn this one up and let ’er rip!

Honorable mention for Bon Scott's scream at the very end of AC/DC's "Dirty Deeds Done Dirt Cheap".

Fun thread!  Geez too many favs to name just one.  

Robert Plant/Zep

-How many more times

-Since I've been loving you

-etc

Geoff Tate/Queensryche

-Queen of the reich

-Take hold of the flame

-etc.

Ian Gillan/Deep Purple

-Strange kind of woman

-Child in time

-etc.

But I concur with a few others that Halford takes the cake for me.  No other like him!

-Dreamer deceiver

-Victim of changes

-Exciter

-etc, etc, etc, etc!

Geddy Lee was a great call too.  He's got a few, Didacts is short but a fine scream none the less!

Lots of good choices here; I might have to check a few of these out. I’m still going with Halford (just my opinion), but I’m also wondering if Bruce Dickinson of Iron Maiden should be mentioned again with Hallowed Be Thy Name? Just a thought --

Wilson Picket!

John Fogarty!

Janis!

John Lennon!

Linda!