John Lennon's "How Do You Sleep" is about Paul McCartney:

A pretty face may last a year or two

But pretty soon they'll see what you can do

The sound you make is muzak to my ears

You must have learned something in all those years

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Paul McCartney's "Silly Love Songs" is his response:

You'd think that people would have had enough of silly love songs

I look around me and I see it isn't so

Some people want to fill the world with silly love songs

And what's wrong with that?