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Source : Interview sur jacopastorius.com

Could you explain in theory what you're doing in 'Portrait of Tracy?' Well, the main melody is in C. The first thing I did was, I was holding down a C with my first finger and with my third and fourth I'm getting a G note on the D string which produces a D9 up top and on the G string you're getting a 3rd which gives you a major 7th and then you come down and get the A on the D string. It's very tight but it's all right there. Everything but the Eb has a natural harmonic; you have to press down on the A string at the B note (second fret) and then you have to touch the string on top of the Eb. If you don't have big hands you won't get this. You touch the string on top of the Eb or it's really a D sharp and you get the D sharp on top of the B. So it's like you're using your first finger as a capo. So then you get the D sharp and pick the open F sharp and B right from the D and the G string and you hit a low E and you also touch it a bit and you get a G sharp or a minor 3rd. So you've got the five, the nine, the three on the bottom, and a major 7th in the middle. And you've got the bass note because you're hitting the bass note and the G sharp. I had never thought about doing this. For instance I was monkeying around with 'Portrait of Tracy' for years and then if I wanted more notes it was just common sense. I said, 'If I've got an open A string and if I hit the harmonic on top and get a C sharp, if I press it down on the B fret I've got to get one on D sharp. I mean it's that simple, that theory has to continue to work. And on the very end of the song I put my finger down and play F sharp and B and E and hit my open E and then I press down my other finger and I've got a high G sharp, D sharp and A sharp on the bottom which gives you a major 7th flat five chord. So it's just stuff like that. I mean all that stuff is right on the bass, it's just a standard tuned bass.