Glen Campbell and Vince must have suffered as I did during that post-disco era. The Sold Gold Countdown says it all with the crappy songs on their Top Ten.
Just 13 years before when Dionne Warwick was collaborating with Burt Bacharach she was singing wonderful classics like DON'T MAKE ME OVER.
EDIT: The piano player that I worked with in Los Angeles was working a Sunday gig with a pickup band that included Glen Campbell around 1966.