Best Singer Songwriter indifferent genres

Okay guys, this isnt a poll because Im not nearly knowledgable about music. As a matter of fact, Im only going to nominate in one genre: Metal Rock.

James Maynard Keenan.

I want to hear some of the greats in this category, as well as any more you would like to bring up.

I have the bad habit of listening to what's popular in certain genres, and would like to hear some of the "greats".