Rowlf leads Muppet cover of Biz Markie's 'Just a Friend' — mashable.com

Rowlf is a piano-playing dog with a deep soul, but he's never found love. In a Muppets version of Biz Markie's hip hop classic "Just a Friend," we learn that Rowlf's heart lies with Miss Piggy, a bovine who only has eyes for Kermit.

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