We often talk about how much of an art radio was in the 60s. Many of the format elements that are today's cliches were being spontaneously created by people like Bob Green, Gary Stevens and Scott Regen. And so it was with the music Keener played. At the outset of the decade a four track recorder was considered high tech and by 1970 the Studer 24 track two inch machines had become ubiquitous. In the beginning, the engineers who produced those four track mixes made a lot of decisions on the fly that are, today, the minutiae of post production. And that's what happened when a stock broker's son named Bones Howe ran the controls as the Mamas and the Papas recorded their first hit. It was built atop a backing track created by Hal Blaine's famed Wrecking Crew for Barry Maguire of "Eve of Destruction" fame. This fascinating article from Mix Magazine details how the artistry in the control room converged with the artists behind the microphone to make rock history.