Hi Mate
One of the main reasons many put out instrumentals in the 60's was cost. For many young artists in the sixties they could only afford studio time for one set of vocals, so would just put the backing track on the B side. But there are many instrumentals that where made to stand on there own, these tend to be less repetitive. I was never a great fan of purely backing tracks that had little extra to offer. But full blown instrumentals for instrumental sake, bring them on.
Sam Ambrose and Friend, G Tyler & R Davis, King Errison, Mike Post, Brothers, Miracle Workers.
Bring back the instrumental!!!!!!!