"The first day we had was remarkable," he said. "[McCartney] walked in with this incredible song, we threw up a couple of microphones and within four hours we had this great track. I think we did an edit between the first two takes."

The veteran soundman continued: "It had an incredible feel � a really evocative piece of music. A very interesting lyric, and the performance was great. Then we started to experiment with it, and I put a bunch of psychedelic strangeness on it. You have fun. 'Oh, try this! Do that!' It's just very inspiring to be around."