It goes without saying that people assumed many of the biggest hits of the ’60s were about drugs. Of course, some actually were, like Jefferson Airplane’s “White Rabbit.” But others, like Donovan‘s “Mellow Yellow,” actually weren’t…even though, in that case, the song did turn out to be about something that was considered pretty risqué at the time. And not only did the average listener not know about the true inspiration for “Mellow Yellow,” they had no idea one of the Beatles played on the track.