Written by Paul McCartney and the late John Lennon for the Beatles in 1967 for the incredible "Sgt. Pepper's Lonely Hearts Club Band" album, the song immediately faced controversy, with some calling the title a "code ode" to the drug LSD.
The songwriters have maintained all along that a drawing by Lennon's son Julian, plus "Alice In Wonderland" contributed to creating the tune.
Now, I do like the Beatles' version, but seven years later, Elton John took it, and really made it his own, and recorded, in my view, the better version of the song. By early 1975, the song hit #1, starting what would be a monster year for John.