Anyway, on to the real point. The melody of the song became a bit difficult to pull for the, then, quite inexperienced lead singer Harrison so producer George Martin suggested a second bass line - a fuzz box laden lead bass line to guide him to the right notes.
Not only did it help him hit the right notes, it also helped this filler track really stand out and introduce a virtually unheard of bass sound to the world. There is also a standard bass line, similar to the basic but soulful playing on the album.
I've uploaded three different versions of this transcription; one with just the regular bass line, one with the fuzz bass and one with both so you can pick and mix.
The latter is probably your best bet if you want to play the song live, as the bass line is quite dull and the fuzz line is fun but a bit to sparse to work as a stand alone bass line.
Thoughts or feedback? Drop me a line in the comments,