LikeASir on My Crazy Theory

I was recently thinking about the fact that in 1963 they had stuff like "love, Love Me Do, you know i love you, i'll always be true" etc to "living is easy with eyes closed, misunderstanding all you see, it's getting hard to be someone but it all works out" 1967 - 4 YEARS! What other bands/musicians have made such a leap in 4 YEARS?
Or even closer, in 1965 there was The Word, with "say the word and you'll be free, say the word and be like me, say the word i'm thinking of, have you heard the ...