Of course The Shangri-Las, a classic!
Do doublenecks count?
There was a time - late seventies - when Barclay James Harvest absolutely ruled Germany, their Gone to Earth album from 1977 stayed in the German charts for nearly four years, making it one of the most popular albums in Germany ever. They had constant sell-out tours, huge gigs (with The Police and Dire Straits as opening acts), a chain of hit singles, radio power play, you name it. Everybody's favorite whimp rock/light proggies.
Critics hated them and no one actually admitted to liking them, yet there were just way too many album sales (a million of Gone to Earth in Germany alone at a time when you went gold with 50.000) for all those people claiming that they did not listen to them to actually tell the truth
, a real closet guilty pleasure!
Yes, I remember liking Gone to Earth too (where Hymn, the two chord - G and D - first track above, is from), but then lost track of what they did other than their general ubiquity at the time.