LOL. That's a good question. Its actually three guitar parts. One is distorted and plays a constant melody line going up the minor scale. Then there is also an arpeggiated clean part using an electric guitar. Third, there is an acoustic guitar playing a very brief melody line. I believe it is a classical guitar.
I do recall that the video for 99ways had Marty with a classical guitar playing the part. It was years ago that I saw the video.