Actually, more times than not, harlowpoet does his pomes without the words in front of him. And from time to time he totally blanks out, like the rest of us.

Interesting to see the numnber of people here who took his tongue-in-cheek suggestion seriously. It seems it's not just some of the Yanks who have a bit of problem with the irony at times...   

Sometimes it isn't the words that go missing, but the tune, either remembering how it goes, or finding a key that doesn't leave your voice stranded at the top or bottom, more especially when you aren'tb using an accompaniment.