I wish I understood...
...if there was an intentional thread or commonality among all the things that "disappeared" from memory that we were supposed to piece together to make sense: Beatles, Oasis, Coca-Cola, cigarettes, Harry Potter, etc. or was it just random?
Also, how did John Lennon live? Did he write music as a young man but just never make it big or was he a guy who never started a band whatsoever in his youth?