NEW YORK - Jack Black may have been schooled in rock, but now he'd like to sing at the Grand Ole Opry with wife Tanya Haden's family, who recently turned him on to bluegrass music.

The 39-year-old actor-musician, who grew up in the Los Angeles area, energetically sings the traditional tune Old Joe Clark on father-in-law Charlie Haden's Grammy-nominated CD Rambling Boy.

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, said Black.

There was something in the music that I think struck a chord in my DNA. I think I've got some hillbilly in my roots. ... I'm already practicing my square dancing if we play the Grand Ole Opry.

Black, who recently starred in Tropic Thunder and the animated Kung Fu Panda, had to be a bit tenacious to land a last-minute supporting role when his father-in-law brought the nearly finished mix to their home so he could hear his wife sing on her own and as part of the Haden Triplets, with sisters Rachel and Petra.

Rambling Boy includes an excerpt from a 1939 Haden Family radio show with 22-month-old Little Cowboy Charlie yodelling on a gospel tune.

Two-year-old Sam, the oldest son of Black and Haden, is already showing he's inherited the family musical DNA after being exposed to everything from Weezer's danceable Surf Wax America to Tchaikovsky's Nutcracker Suite.

Our son is already yodeling better than my father, said Tanya Haden. He already has his own taste in music. He'll hear something and do his own rendition and we'll try to sing along with him and he'll tell us to shut up.