The Beatles: 10 Perfect Non-Single Tracks

You can practically hear the lysergic acid dripping from this number. When the Beatles dropped Sgt. Pepper's in the spring of '67, the media was awash with stories that it was a record informed by, and riddled with references to, drug taking.

Lennon had openly admitted to dabbling in the odd substance in the run up to making the album, but when someone pointed out that the initials of one particular song made the acronym "LSD", the media had a field day. The BBC banned the song, which may have influenced the reason for it not being released as a single.

Lennon would vehemently deny that the track had been intended to be a 'drug-song'. Instead, he claimed it was inspired by the writings of Lewis Carroll's Alice In Wonderland; according to Lennon he took the songs title from a drawing his young son Julien had shown him, entitled "Lucy In The Sky".

Whatever the truth is, it's clear that the Beatles' approach to writing had taken a dramatic shift by '67; years later, Paul McCartney freely admitted that drugs undoubtably played a part.