How about 'You ought to bake a sunshine cake'
Bing used to sing it, but I can only recall bits of the lyric,

Well it's not from a recipe book,
And yuo don't have to be a good cook,
Or run to the oven and look,
It's a simple dish, all you do is wish.

Oh. and regarding those blackbirds.

Sing a song of sixpence, a pocket full of rye,
Four and twenty blackbirds baked in a pie,
When the pi was opened the shrivelled birds just sat,
Saying 'Alright, a joke's a joke what silly sod did that!
(Richard Digance)

FC