I dug all the way down into wikipedia to get this little tidbit o’ knowledge:
Bowie later recalled:
…the most absurd situation I encountered when I was recording was the first time I worked with Iggy Pop. He wanted me to mix Raw Power, so he brought the 24-track tape in, and he put it up. He had the band on one track, lead guitar on another and him on a third. Out of 24 tracks there were just three tracks that were used. He said ‘see what you can do with this’. I said, ‘Jim, there’s nothing to mix’. So we just pushed the vocal up and down a lot. On at least four or five songs that was the situation, including “Search and Destroy.” That’s got such a peculiar sound because all we did was occasionally bring the lead guitar up and take it out.”