'Spirits in the Material World' was written on one of those Casio keyboards while I was riding in the back of a truck somewhere. I just tap, tap, tap and there it was, just by accident. That was the first time I'd ever touched a synthesizer, that album. — Sting, Synchronicity Tour Program, 1983 Andy Summers' presence on the studio track is considerably less pronounced than on the vast majority of Police songs, and in fact, Sting wanted to record it without him entirely. Having written the song on a synthesizer, he wanted for it to use synthesizer instead of guitar, and to play the synthesizer part himself. Summers thought the synthesizer part should be replaced by guitar, and after considerable argument, they compromised by recording the part on both instruments, with a mix such that the synthesizer drowned out much of Summers's guitar.