10 Albums With Actual Hidden Messages
2. Pink Floyd Actually Are Hiding Stuff From You

Roger Waters strikes again! The Floyd were one of the other psychedelic, slightly druggy sixties/seventies bands to get accused of placing subliminal messages in their music, which is pretty believable when you consider how trippy and weird some of their records are. In fact they had never really messed with backmasking until after the accusations started rolling on, which is rather ironic. Their first big foray into the lost art of hidden messages came with their 1979 magnum opus The Wall, Waters' semi-autobiographical concept album about his traumatising childhood and the sad departing of original Pink Floyd singer Syd Barret due to mental health issues.
https://www.youtube.com/watch?v=wfktg03AnNM
Empty Spaces, a song which comes about halfway through the double LP, has the rather long hidden message Hello, Luka. Congratulations. You've just discovered the secret message. Please send your answer to Old Pink, care of the funny farm, Chalfont. Roger! Carolyne is on the phone! Okay. Possibly part of the concept album's narrative, possibly a less-than-sensitive reference to Barret's issues and time spent in mental health units. Possibly more fun than that is that the album starts ends with the phrase Isn't this where... and begins with ...we came in?, bringing the whole record full circle. Those clever, clever hippies.