Lyric discussion by radiodredg 

the lyrics to this song are actually quite clever. This song is about obsession - that constant want or desire that keeps weighing so "heavily" on one's thoughts. Who he wrote the song about is hardly even the point, although it is nice to know what was going through his head. The simplicity of the lyrics really drive the message home. The song isn't reflective on the obsession, nor does it really bother with symbolism or rhyme. The lyrics are repetitive and thoughtless, just like any obsession. Obsessions are blinding, they force us to see the surface and prevent us from seeing the big picture, thus the lack of symbolism and thought to the lyrics. The words are as repetitive as the obsession that runs through his head. The thoughtlessness and simplicity to the lyrics of this song is exactly the point of the song. So before anybody thinks any less of the beatles for writing "brainless, thoughtless" lyrics, think about how brainless and thoughtless humans can truly be when blinded by an obsession. Whether or not the obsession is good or bad, its all blinding and instinctive in the end.

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