As I write this letter
Send my love to you

from The Beatles – P.S. I Love You Lyrics on Rap Genius

Meaning

This song was written entirely by Paul McCartney (though credited to McCartney-Lennon as all songs of that era were), and was his simple attempt at writing a “letter song”. McCartney said:

It was pretty much mine. I don’t think John had much of a hand in it. There are certain themes that are easier than others to hang a song on, and a letter is one of them. ‘Dear John’ is the other version of it. The letter is a popular theme and it’s just my attempt at one of those. It’s not based in reality, nor did I write it to my girlfriend from Hamburg, which some people think.

McCartney would write many letter songs throughout his career, many of them amongst his most memorable hits, including Paperback Writer, Day Tripper and Dear Friend.
http://www.youtube.com/watch?v=taADLPtyDb0

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