Details details
The car was dismantled completely, and the parts were sorted into boxes and around the workshop (door parts with door parts, etc.). I had previous experience making the Car Music Project instruments from my old Honda Accord, so that experience was applied. But, the basic process is one of putting together a puzzle.
We had requirements for wind, brass, percussion, and string instruments that could play the music that was presented to us. We were also required — for credibility and authenticity — to make instruments from intact car parts as much as possible (as opposed to making major or defining parts out of sheet metal from the body of the car). And most important, the instruments had to A) be able to play in tune according to traditional western standards, and B) they had to be physically close enough to traditional instruments to enable professional musicians to learn them quickly because they would only have one or two rehearsals before recording the music. Finally, they had to be visually attractive; call it compelling if you like. In other words, television is mainly a visual medium and they needed to look great.
Back to putting together the puzzle … We laid the car parts out, on the floor and on work tables, to see what parts might fit together in functional and interesting ways. We tried this with that, that with this, and both this and that with the other thing, drawing on our previous experience along the way (i.e.: “That won’t work because …” or “Ah, that will work nicely because …”). We combined and made notes, along with videos, photographs, and sketches that were sent to the director, Noam Murro. When he liked and approved an idea, we began building.
Now, you must realize, a car has only so many parts. Two cars were shipped to us from Europe. So, in considering the “puzzle,” we had to make sure we did not use a part on a not-so-necessary instrument that would be needed on a necessary instrument. But, that is the kind of issue that gets sorted out along the way and which having done it previously helps.
http://createdigitalmusic.com/2008/02/05/interview-building-a-musical-ensemble-out-of-ford-focus-car-parts/