I was going to cite one particular Robert Plant scream: the "looooooooooooooooove" near the end of "Whole Lotta Love"

Way down inside
Woman
You need...
(crashing drums/guitars)
Looooooooooooooooooooooove


Other notables:
The sustained wail at the end of "Born in the USA"
A few sustained screams in G'N'R's "Welcome to the Jungle"

I would agree that the Daltry scream in "Won't Get Fooled Again" is unbelievable and nearly impossible to replicate