not to mention that practice (laying down bass, drums, and piano as a backing track) was also before they started to work with Mack, who taught them about looping and editing, and that you didn't have to record a full, perfect backing track before you started working overdubs. and also, by the time of tbe Innuendo sessions, they were all much more adept at playing each others instruments, and the technology had progressed considerably, to the point where one person could easily lay down a full demo by themselves.
