Watch a clip of Bob Mould and Dave Grohl performing Hüsker Dü's "Ice Cold Ice."

If you had any doubt in your mind whether or not Bob Mould -- most famous for his stints with Hüsker Dü in the 80s and Sugar in the 90s -- still had "it," just watch this video of his performance on Letterman last night embedded above and put all your doubts to rest.

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The best new songs of the week, including Wavves, Thee Oh Sees, the Darkness, Bob Mould, and more.

Shocking news flash: The Roots are great at music, and even better at playing it in front of you.

Why, you ask.