WCCO never gets much air on this site, but Bob says:

‘CCO made a bit of an effort in the early ’70s to shift its music to being a bit hipper. “Hip” to ‘CCO consisted essentially of The Fifth Dimension and the Carpenters. They might actually have broken down and played “Yesterday” by the Beatles once or twice and maybe “The Wreck of the Edmund Fitzgerald” by Gordon Lightfoot [1976]. Howard Viken, their hugely popular morning guy, did a lot to break “(They Long to Be) Close to You” in the late spring and early summer of 1970 – he played it pretty much every day, he LOVED that record.

And that, my friends, might be the first and last you see of WCCO.  Not hip.  But thanks, Bob!