The song was inspired by Texas bluesman Joey Long. As Billy Gibbons tells it, Long always had a new Cadillac. However, since he didn’t have a drivers license, his beautiful wife Barbarella used to drive him to gigs. Long died in 1995. The song is also noteworthy as the only tune other than Somebody Else Been Shaking Your Tree where Gibbons plays pedal steel guitar.

Gibbons also plays “a multi-stringed mandolin-like instrument from Parral, Mexico” that Long gave him. “If you listen closely, you can hear close-miked mandolin-sounding rhythm accompaniment,” he told Guitar World. “The lead track was played on a custom-made, half-sized, real short-scaled guitar tuned to G. It was actually standard tuning cranked up three steps, which remained quite playable thanks to the guitar’s short scale. The song’s tail end alternates between three distinct effects created by two pedals: an Echoplex doubler and a Maestro octave box alternating every third bar between having the octave up and the octave down.”

Source – here