When British pop act the Zombies arrived at Abbey Road Studios in June of 1967, the Beatles had just finished wrapping up the sessions for Sgt. Pepper’s Lonely Hearts Club Band. By April 21st, the Beatles had logged hundreds of hours for their ambitious eighth studio record, although the sessions for Sgt. Pepper’s included dates that yielded non-LP tracks like “Only a Northern Song” and more. When those reportedly agonizing sessions of tape splicing and manual scissor edits adjourned, the Beatles left a number of instruments behind. Among them was a Mellotron, an early 1960s era keyboard that offered sample playback via magnetic audio tape. That summer, the Zombies were eager to incorporate Mellotron sounds in the recording of their sophomore album Odessey & Oracle, a polished, classically-influenced cornerstone of English psychedelic pop. The band split before Odessey saw release, much less before its single “Time of the Season” garnered number-one chart status in 1969.