What this article seems to also be missing is that there are actually two versions of the song. I'd say that the final recording is indisputably Lennon, but the

What this article seems to also be missing is that there are actually two versions of the song. I'd say that the final recording is indisputably Lennon, but the original is very much McCartney. The final version's lyrics are abstract and have the interplay of dark and light. The original version is very concrete and almost ballad-like, very much McCartney's style (it even mentions Penny Lane). What this kind of approach misses is that shared writing credits don't necessarily mean writing together at the same time. While the two have been known to go off and write a piece together, I think there's a decent argument to be made that McCartney sketched out the idea for "In My Life" and Lennon refined it.