‘Macarthur Park’ for instance... In my humble opinion that would be the most complex pop song ever.
Say what you will, but The Wrecking Crew killed it on that, especially the middle instrumental part.
I loved "MacArthur Park" when it was riding the charts because Douglas MacArthur was one of my heroes at the time (and still is) and because it was about Southern California. The instrumental part was used for the evening news broadcast on KTTV, which was anchored by George Putnam, one of the giants among conservatives in the media.