Chunklet writer Ben Johnson has posted an informative history of the grunt in rock music at vice.com. I agree with most of his choices, but of course there are some omissions, which may or may not be glaring, depending on your listening experiences.
For one, Edwin Starr's "War" [see clip after the cut] is simply the bomb of gravelly emissions. For another, Joe Tex's feral gutturals in "I Gotcha" have to be here, too (Quentin Tarantino's got my back on this one). For yet another, the Birthday Party's Nick Cave has emitted his share of top-shelf grunting; maybe include "Release the Bats"? What other memorable grunts need to be in this pantheon? (I know I'm forgetting some crucial ones, damn it...)