"You guys know each other?" Jay Leno said. Yeah, they've met before. And they've got a bit of a rivalry going on. And so, on the new 'Tonight Show' (11:35PM ET on NBC), the two legendary singers of our generation -- Grammy Award-winner Michael Bublé and, um, Jack Black -- squared off in a battle for supremacy.
The two vocalists recalled a previous "sing-off" encounter that they had on an Australian talk show. Next, inspired by Black's performance in 'School of Rock,' the pair tried to determine who was more "hardcore" -- singing-wise, that is. Because really, you're not hardcore ... unless you live hardcore.
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