Deep Purple writes songs as a band, and everyone is in the same room for most of the process. This poses an interesting challenge for a song like this, since lyrics are typically added last. In our interview with Deep Purple guitarist Steve Morse
, he explained: "At some point, production choices are made. On 'Vincent Price,' Bob Ezrin put a little filtered steel guitar, theremin sounding riff, that goes, (singing) wooo ooo ooo. Like that. He put that in after the song was decided that it was going to be referring to the classic horror movie."