As I've said before, the biggest damage to a sense of pop music history was that the Boomers came up at the same time as the switch from 78s to 45s so all the radio stations threw out their Louis Jordan records and an "oldie" was something from the last five years.
Ned RaggettThe way the history of pop was warped by boomer criticism/historiography into a hard dividing line between a supposed glop past and Elvis-and-everything-after with a rock focus was a massive reductive mistake that is still playing out.