A sparkling moment from the 1970s

I'm still giggling periodically about the clothes in those old Penney's catalogs, and it put me in mind of the classic music videos from the 1970s. I happen to like this Abba one which, although it has no funky 70s clothes, does have the best, bounciest music, and a naiveté about student/teacher interactions that is hard to imagine considering how constantly we're being bombarded with stories of teachers taking advantage of students.