Movie fans are most familiar with comedic-actor Jack Black, 39, from his roles in films such as the animated hit, Kung Fu Panda, or the recent Tropic Thunder, as well as Shallow Hal, Nacho Libre, Saving Silverman, Orange County, King Kong, Be Kind Rewind, Envy and School of Rock, among other flicks.

But in a recent interview, the California native said singing with his father-in-law, jazz double-bassist Charlie Haden, on the traditional bluegrass song called "Old Joe Clark" was something that came surprisingly natural to the quirky thespian who’s gravitated toward rock ‘n’ roll, not country music, for most of his life.

"I wasn't sure what to expect, because I haven't recorded or really sung any old songs like that before, bluegrass style, but it came very naturally and I cranked it out in two takes," Black remarked in the AP interview, referring to his rendition of "Old Joe Clark," which is contained on Haden’s 19-song, Grammy-nominated "Rambling Boy" CD.

"There was something in the music that I think struck a chord in my DNA," Black has said of his energetic foray into bluegrass. "I think I've got some hillbilly in my roots. ... (And) I'm already practicing my square dancing if we play the Grand Ole Opry."

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