Even though I wasn't a huge fan of the grunge movement at the time, I really appreciated some of the stuff Soundgarden did musically. And yes, that voice was off the charts. Many moons ago, before you could pull up a tutorial on any song on the Youtubes, I was taking guitar from one of the most gifted musicians I've ever met. I didn't want theory, I wanted to take him a song and say "Show me."
He could listen to something once or twice and be ready to teach me every guitar part. There was one Soundgarden song I gave him (Forget which one now) He listened, started showing me the chords etc. and we both just stopped and agreed to move on to something else. "No, you're not playing this."
You're right. How bout' some Hank Jr.?