I can't believe no-one's mentioned 'Isn't it Grand, Boys' by the Clancy Brothers.

To remind you:

'Let's not have a sniffle,
let's have a bloody good cry,
and always remember the longer you live,
the sooner you'll bloody well die.'

Either that or Sarah Vaughan singing 'I'll be seeing you'.

But do I have to make up my mind now?