Black Sabbath star Tony Iommi has written a new tune for hit Tv drama Csi: Crime Scene Investigation.

The guitarist has revealed he composed the piece for one of his favourite shows while winding down from his band's recent world tour.

He says, "I'm getting back in the studio, having tried to make myself rest after the tours. I'm writing, mostly just putting ideas down rather than complete songs. I like to create all sorts of moods with my music and then decide later how they might be used. One specific piece, though, is for the Csi Tv series that will be aired in the U.S. on November 2nd.

"I was asked if I'd be interested, so I had a look at the footage and came up with an idea they (producers) seemed to like. It's not very long, but it was different working with images rather than just music. I'd certainly be up for doing more."

It's not the first time one of his tracks has been linked to the long-running show - Black Sabbath's Dear Father, from the band's 2013 album, 13, was featured in an episode of Csi last year (13).

The group also performed a new song on the season finale of the series in May, 2013.