Beatles songs, Golden Slumbers

PAUL 1969: 'I was just playing the piano in Liverpool at my dad's house, and my sister Ruth's piano book… she was learning piano… and 'Golden Slumbers and your old favorites' was up on the stand, you know – it was a little book with all those words in it.
I was just flipping through it and I came to 'Golden Slumbers.' I can't read music so I didn't know the tune… I can't remember the old tune… so I just started playing 'my' tune to it.
And then, I liked the words so I just kept that, you know, and then it fitted with another bit of song I had – which is the verse in between it.
So I just made that into a song.
It just happened 'cuz I was reading her book.'