Which song is the opening theme to the original BBC TV show 'Top Gear'?

"Jessica" is an instrumental piece by American rock band the Allman Brothers Band, released in December 1973 as the second single from the group's fourth studio album, Brothers and Sisters (1973). Written by guitarist Dickey Betts, the song is a tribute to Gypsy jazz guitarist Django Reinhardt, in that it was designed to be played using only two fingers on the left hand.

The tune is perhaps most famous as the opening theme to the original BBC TV show Top Gear and for the 2002 format of the series, albeit a modernised cover version. In one episode, James May recreated the tune using nothing but exhaust notes from several cars, while in another episode the tune in its full version was heard to be played over the radio when the three presenters tested in America (Series 12, Episode 2). At the last episode's end of the 18th series of the show, ex Guns N' Roses guitarist Slash played his version of the tune. "Jessica" is also used for most international versions of Top Gear, including the US version which used it as its theme only during the first season.