Always felt Chris Cornell was a very unique and special vocalist. What's fun about a lot of soundgarden songs is that you can sing them an octave lower and sometimes slow them down and it creates an even more interesting/eerie sound.
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Seems like this would be a great track whilst running. I was not one to run with headphones while outdoors but treadmills were different.
http://youtu.be/6anTpe1WGAA
Whenever this one came on it always turned into a sprint. Joe Cocker is the only guy who can do the Beatles better than the Beatles.
http://youtu.be/Xraj86LNgYc